CVE-2026-5731
Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
CVE-2026-5731 is fixed in 241 products on 2 platforms, first by Mozilla Firefox ESR (ach) 140.9.1, released April 7, 2026. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
9.8
important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0035
29th percentile
Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (ach) | 140.9.1 | Mozilla Firefox ESR (ach) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (af) | 140.9.1 | Mozilla Firefox ESR (af) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (an) | 140.9.1 | Mozilla Firefox ESR (an) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ar) | 140.9.1 | Mozilla Firefox ESR (ar) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ast) | 140.9.1 | Mozilla Firefox ESR (ast) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (az) | 140.9.1 | Mozilla Firefox ESR (az) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (be) | 140.9.1 | Mozilla Firefox ESR (be) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (bg) | 140.9.1 | Mozilla Firefox ESR (bg) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (bn) | 140.9.1 | Mozilla Firefox ESR (bn) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (br) | 140.9.1 | Mozilla Firefox ESR (br) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (bs) | 140.9.1 | Mozilla Firefox ESR (bs) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ca) | 140.9.1 | Mozilla Firefox ESR (ca) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ca-valencia) | 140.9.1 | Mozilla Firefox ESR (ca-valencia) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (cak) | 140.9.1 | Mozilla Firefox ESR (cak) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (cs) | 140.9.1 | Mozilla Firefox ESR (cs) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (cy) | 140.9.1 | Mozilla Firefox ESR (cy) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (da) | 140.9.1 | Mozilla Firefox ESR (da) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (de) | 140.9.1 | Mozilla Firefox ESR (de) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (dsb) | 140.9.1 | Mozilla Firefox ESR (dsb) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (el) | 140.9.1 | Mozilla Firefox ESR (el) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (en-CA) | 140.9.1 | Mozilla Firefox ESR (en-CA) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (en-GB) | 140.9.1 | Mozilla Firefox ESR (en-GB) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (en-US) | 140.9.1 | Mozilla Firefox ESR (en-US) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (eo) | 140.9.1 | Mozilla Firefox ESR (eo) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (es-AR) | 140.9.1 | Mozilla Firefox ESR (es-AR) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (es-CL) | 140.9.1 | Mozilla Firefox ESR (es-CL) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (es-ES) | 140.9.1 | Mozilla Firefox ESR (es-ES) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (es-MX) | 140.9.1 | Mozilla Firefox ESR (es-MX) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (et) | 140.9.1 | Mozilla Firefox ESR (et) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (eu) | 140.9.1 | Mozilla Firefox ESR (eu) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (fa) | 140.9.1 | Mozilla Firefox ESR (fa) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ff) | 140.9.1 | Mozilla Firefox ESR (ff) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (fi) | 140.9.1 | Mozilla Firefox ESR (fi) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (fr) | 140.9.1 | Mozilla Firefox ESR (fr) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (fur) | 140.9.1 | Mozilla Firefox ESR (fur) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (fy-NL) | 140.9.1 | Mozilla Firefox ESR (fy-NL) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ga-IE) | 140.9.1 | Mozilla Firefox ESR (ga-IE) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (gd) | 140.9.1 | Mozilla Firefox ESR (gd) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (gl) | 140.9.1 | Mozilla Firefox ESR (gl) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (gn) | 140.9.1 | Mozilla Firefox ESR (gn) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (gu-IN) | 140.9.1 | Mozilla Firefox ESR (gu-IN) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (he) | 140.9.1 | Mozilla Firefox ESR (he) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (hi-IN) | 140.9.1 | Mozilla Firefox ESR (hi-IN) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (hr) | 140.9.1 | Mozilla Firefox ESR (hr) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (hsb) | 140.9.1 | Mozilla Firefox ESR (hsb) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (hu) | 140.9.1 | Mozilla Firefox ESR (hu) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (hy-AM) | 140.9.1 | Mozilla Firefox ESR (hy-AM) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ia) | 140.9.1 | Mozilla Firefox ESR (ia) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (id) | 140.9.1 | Mozilla Firefox ESR (id) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (is) | 140.9.1 | Mozilla Firefox ESR (is) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (it) | 140.9.1 | Mozilla Firefox ESR (it) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ja) | 140.9.1 | Mozilla Firefox ESR (ja) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ka) | 140.9.1 | Mozilla Firefox ESR (ka) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (kab) | 140.9.1 | Mozilla Firefox ESR (kab) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (kk) | 140.9.1 | Mozilla Firefox ESR (kk) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (km) | 140.9.1 | Mozilla Firefox ESR (km) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (kn) | 140.9.1 | Mozilla Firefox ESR (kn) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ko) | 140.9.1 | Mozilla Firefox ESR (ko) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (lij) | 140.9.1 | Mozilla Firefox ESR (lij) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (lt) | 140.9.1 | Mozilla Firefox ESR (lt) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (lv) | 140.9.1 | Mozilla Firefox ESR (lv) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (mk) | 140.9.1 | Mozilla Firefox ESR (mk) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (mr) | 140.9.1 | Mozilla Firefox ESR (mr) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ms) | 140.9.1 | Mozilla Firefox ESR (ms) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (my) | 140.9.1 | Mozilla Firefox ESR (my) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (nb-NO) | 140.9.1 | Mozilla Firefox ESR (nb-NO) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (ne-NP) | 140.9.1 | Mozilla Firefox ESR (ne-NP) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (nl) | 140.9.1 | Mozilla Firefox ESR (nl) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (nn-NO) | 140.9.1 | Mozilla Firefox ESR (nn-NO) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (oc) | 140.9.1 | Mozilla Firefox ESR (oc) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (pa-IN) | 140.9.1 | Mozilla Firefox ESR (pa-IN) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (pl) | 140.9.1 | Mozilla Firefox ESR (pl) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (pt-BR) | 140.9.1 | Mozilla Firefox ESR (pt-BR) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (pt-PT) | 140.9.1 | Mozilla Firefox ESR (pt-PT) 140.9.1 | Apr 7, 2026 |
| Mozilla Firefox ESR (rm) | 140.10.0 | Mozilla Firefox ESR (rm) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (ro) | 140.10.0 | Mozilla Firefox ESR (ro) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (ru) | 140.10.0 | Mozilla Firefox ESR (ru) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sc) | 140.10.0 | Mozilla Firefox ESR (sc) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sco) | 140.10.0 | Mozilla Firefox ESR (sco) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (si) | 140.10.0 | Mozilla Firefox ESR (si) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sk) | 140.10.0 | Mozilla Firefox ESR (sk) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sl) | 140.10.0 | Mozilla Firefox ESR (sl) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (son) | 140.10.0 | Mozilla Firefox ESR (son) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sq) | 140.10.0 | Mozilla Firefox ESR (sq) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sr) | 140.10.0 | Mozilla Firefox ESR (sr) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (sv-SE) | 140.10.0 | Mozilla Firefox ESR (sv-SE) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (szl) | 140.10.0 | Mozilla Firefox ESR (szl) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (ta) | 140.10.0 | Mozilla Firefox ESR (ta) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (te) | 140.10.0 | Mozilla Firefox ESR (te) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (tg) | 140.10.0 | Mozilla Firefox ESR (tg) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (th) | 140.10.0 | Mozilla Firefox ESR (th) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (tl) | 140.10.0 | Mozilla Firefox ESR (tl) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (tr) | 140.10.0 | Mozilla Firefox ESR (tr) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (trs) | 140.10.0 | Mozilla Firefox ESR (trs) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (uk) | 140.10.0 | Mozilla Firefox ESR (uk) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (ur) | 140.10.0 | Mozilla Firefox ESR (ur) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (uz) | 140.10.0 | Mozilla Firefox ESR (uz) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (vi) | 140.10.0 | Mozilla Firefox ESR (vi) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (xh) | 140.10.0 | Mozilla Firefox ESR (xh) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (zh-CN) | 140.10.0 | Mozilla Firefox ESR (zh-CN) 140.10.0 | Apr 21, 2026 |
| Mozilla Firefox ESR (zh-TW) | 140.10.0 | Mozilla Firefox ESR (zh-TW) 140.10.0 | Apr 21, 2026 |
| Mozilla Thunderbird (af) | 149.0.2 | Mozilla Thunderbird (af) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ar) | 149.0.2 | Mozilla Thunderbird (ar) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ast) | 149.0.2 | Mozilla Thunderbird (ast) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (be) | 149.0.2 | Mozilla Thunderbird (be) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (bg) | 149.0.2 | Mozilla Thunderbird (bg) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (br) | 149.0.2 | Mozilla Thunderbird (br) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ca) | 149.0.2 | Mozilla Thunderbird (ca) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (cak) | 149.0.2 | Mozilla Thunderbird (cak) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (cs) | 149.0.2 | Mozilla Thunderbird (cs) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (cy) | 149.0.2 | Mozilla Thunderbird (cy) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (da) | 149.0.2 | Mozilla Thunderbird (da) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (de) | 149.0.2 | Mozilla Thunderbird (de) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (dsb) | 149.0.2 | Mozilla Thunderbird (dsb) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (el) | 149.0.2 | Mozilla Thunderbird (el) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (en-CA) | 149.0.2 | Mozilla Thunderbird (en-CA) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (en-GB) | 149.0.2 | Mozilla Thunderbird (en-GB) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (en-US) | 149.0.2 | Mozilla Thunderbird (en-US) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (es-AR) | 149.0.2 | Mozilla Thunderbird (es-AR) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (es-ES) | 149.0.2 | Mozilla Thunderbird (es-ES) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (es-MX) | 149.0.2 | Mozilla Thunderbird (es-MX) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (et) | 149.0.2 | Mozilla Thunderbird (et) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (eu) | 149.0.2 | Mozilla Thunderbird (eu) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (fi) | 149.0.2 | Mozilla Thunderbird (fi) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (fr) | 149.0.2 | Mozilla Thunderbird (fr) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (fy-NL) | 149.0.2 | Mozilla Thunderbird (fy-NL) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ga-IE) | 149.0.2 | Mozilla Thunderbird (ga-IE) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (gd) | 149.0.2 | Mozilla Thunderbird (gd) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (gl) | 149.0.2 | Mozilla Thunderbird (gl) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (he) | 149.0.2 | Mozilla Thunderbird (he) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (hr) | 149.0.2 | Mozilla Thunderbird (hr) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (hsb) | 149.0.2 | Mozilla Thunderbird (hsb) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (hu) | 149.0.2 | Mozilla Thunderbird (hu) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (hy-AM) | 149.0.2 | Mozilla Thunderbird (hy-AM) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (id) | 149.0.2 | Mozilla Thunderbird (id) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (is) | 149.0.2 | Mozilla Thunderbird (is) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (it) | 149.0.2 | Mozilla Thunderbird (it) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ja) | 149.0.2 | Mozilla Thunderbird (ja) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ka) | 149.0.2 | Mozilla Thunderbird (ka) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (kab) | 149.0.2 | Mozilla Thunderbird (kab) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (kk) | 149.0.2 | Mozilla Thunderbird (kk) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ko) | 149.0.2 | Mozilla Thunderbird (ko) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (lt) | 149.0.2 | Mozilla Thunderbird (lt) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (lv) | 149.0.2 | Mozilla Thunderbird (lv) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ms) | 149.0.2 | Mozilla Thunderbird (ms) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (nb-NO) | 149.0.2 | Mozilla Thunderbird (nb-NO) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (nl) | 149.0.2 | Mozilla Thunderbird (nl) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (nn-NO) | 149.0.2 | Mozilla Thunderbird (nn-NO) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (pa-IN) | 149.0.2 | Mozilla Thunderbird (pa-IN) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (pl) | 149.0.2 | Mozilla Thunderbird (pl) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (pt-BR) | 149.0.2 | Mozilla Thunderbird (pt-BR) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (pt-PT) | 149.0.2 | Mozilla Thunderbird (pt-PT) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (rm) | 149.0.2 | Mozilla Thunderbird (rm) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ro) | 149.0.2 | Mozilla Thunderbird (ro) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (ru) | 149.0.2 | Mozilla Thunderbird (ru) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (sk) | 149.0.2 | Mozilla Thunderbird (sk) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (sl) | 149.0.2 | Mozilla Thunderbird (sl) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (sq) | 149.0.2 | Mozilla Thunderbird (sq) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (sr) | 149.0.2 | Mozilla Thunderbird (sr) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (sv-SE) | 149.0.2 | Mozilla Thunderbird (sv-SE) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (th) | 149.0.2 | Mozilla Thunderbird (th) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (tr) | 149.0.2 | Mozilla Thunderbird (tr) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (uk) | 149.0.2 | Mozilla Thunderbird (uk) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (uz) | 149.0.2 | Mozilla Thunderbird (uz) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (vi) | 149.0.2 | Mozilla Thunderbird (vi) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (zh-CN) | 149.0.2 | Mozilla Thunderbird (zh-CN) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird (zh-TW) | 149.0.2 | Mozilla Thunderbird (zh-TW) 149.0.2 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (af) | 140.9.1 | Mozilla Thunderbird ESR (af) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ar) | 140.9.1 | Mozilla Thunderbird ESR (ar) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ast) | 140.9.1 | Mozilla Thunderbird ESR (ast) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (be) | 140.9.1 | Mozilla Thunderbird ESR (be) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (bg) | 140.9.1 | Mozilla Thunderbird ESR (bg) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (br) | 140.9.1 | Mozilla Thunderbird ESR (br) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ca) | 140.9.1 | Mozilla Thunderbird ESR (ca) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (cak) | 140.9.1 | Mozilla Thunderbird ESR (cak) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (cs) | 140.9.1 | Mozilla Thunderbird ESR (cs) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (cy) | 140.9.1 | Mozilla Thunderbird ESR (cy) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (da) | 140.9.1 | Mozilla Thunderbird ESR (da) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (de) | 140.9.1 | Mozilla Thunderbird ESR (de) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (dsb) | 140.9.1 | Mozilla Thunderbird ESR (dsb) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (el) | 140.9.1 | Mozilla Thunderbird ESR (el) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (en-CA) | 140.9.1 | Mozilla Thunderbird ESR (en-CA) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (en-GB) | 140.9.1 | Mozilla Thunderbird ESR (en-GB) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (en-US) | 140.9.1 | Mozilla Thunderbird ESR (en-US) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (es-AR) | 140.9.1 | Mozilla Thunderbird ESR (es-AR) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (es-ES) | 140.9.1 | Mozilla Thunderbird ESR (es-ES) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (es-MX) | 140.9.1 | Mozilla Thunderbird ESR (es-MX) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (et) | 140.9.1 | Mozilla Thunderbird ESR (et) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (eu) | 140.9.1 | Mozilla Thunderbird ESR (eu) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (fi) | 140.9.1 | Mozilla Thunderbird ESR (fi) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (fr) | 140.9.1 | Mozilla Thunderbird ESR (fr) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (fy-NL) | 140.9.1 | Mozilla Thunderbird ESR (fy-NL) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ga-IE) | 140.9.1 | Mozilla Thunderbird ESR (ga-IE) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (gd) | 140.9.1 | Mozilla Thunderbird ESR (gd) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (gl) | 140.9.1 | Mozilla Thunderbird ESR (gl) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (he) | 140.9.1 | Mozilla Thunderbird ESR (he) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (hr) | 140.9.1 | Mozilla Thunderbird ESR (hr) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (hsb) | 140.9.1 | Mozilla Thunderbird ESR (hsb) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (hu) | 140.9.1 | Mozilla Thunderbird ESR (hu) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (hy-AM) | 140.9.1 | Mozilla Thunderbird ESR (hy-AM) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (id) | 140.9.1 | Mozilla Thunderbird ESR (id) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (is) | 140.9.1 | Mozilla Thunderbird ESR (is) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (it) | 140.9.1 | Mozilla Thunderbird ESR (it) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ja) | 140.9.1 | Mozilla Thunderbird ESR (ja) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ka) | 140.9.1 | Mozilla Thunderbird ESR (ka) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (kab) | 140.9.1 | Mozilla Thunderbird ESR (kab) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (kk) | 140.9.1 | Mozilla Thunderbird ESR (kk) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ko) | 140.9.1 | Mozilla Thunderbird ESR (ko) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (lt) | 140.9.1 | Mozilla Thunderbird ESR (lt) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (lv) | 140.9.1 | Mozilla Thunderbird ESR (lv) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ms) | 140.9.1 | Mozilla Thunderbird ESR (ms) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (nb-NO) | 140.9.1 | Mozilla Thunderbird ESR (nb-NO) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (nl) | 140.9.1 | Mozilla Thunderbird ESR (nl) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (nn-NO) | 140.9.1 | Mozilla Thunderbird ESR (nn-NO) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (pa-IN) | 140.9.1 | Mozilla Thunderbird ESR (pa-IN) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (pl) | 140.9.1 | Mozilla Thunderbird ESR (pl) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (pt-BR) | 140.9.1 | Mozilla Thunderbird ESR (pt-BR) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (pt-PT) | 140.9.1 | Mozilla Thunderbird ESR (pt-PT) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (rm) | 140.9.1 | Mozilla Thunderbird ESR (rm) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ro) | 140.9.1 | Mozilla Thunderbird ESR (ro) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (ru) | 140.9.1 | Mozilla Thunderbird ESR (ru) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (sk) | 140.9.1 | Mozilla Thunderbird ESR (sk) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (sl) | 140.9.1 | Mozilla Thunderbird ESR (sl) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (sq) | 140.9.1 | Mozilla Thunderbird ESR (sq) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (sr) | 140.9.1 | Mozilla Thunderbird ESR (sr) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (sv-SE) | 140.9.1 | Mozilla Thunderbird ESR (sv-SE) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (th) | 140.9.1 | Mozilla Thunderbird ESR (th) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (tr) | 140.9.1 | Mozilla Thunderbird ESR (tr) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (uk) | 140.9.1 | Mozilla Thunderbird ESR (uk) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (uz) | 140.9.1 | Mozilla Thunderbird ESR (uz) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (vi) | 140.9.1 | Mozilla Thunderbird ESR (vi) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (zh-CN) | 140.9.1 | Mozilla Thunderbird ESR (zh-CN) 140.9.1 | Apr 7, 2026 |
| Mozilla Thunderbird ESR (zh-TW) | 140.9.1 | Mozilla Thunderbird ESR (zh-TW) 140.9.1 | Apr 7, 2026 |
| Linux | |||
| MozillaFirefox · opensuse-leap 16.0 | 140.9.1-160000.1.1 | OPENSUSE-SU-2026:20486-1 | Apr 9, 2026 |
| MozillaFirefox · sles 15.6 | 140.9.1-150200.152.228.1 | SUSE-SU-2026:1322-1 | Apr 14, 2026 |
| MozillaFirefox · sles 15.7 | 140.9.1-150200.152.228.1 | SUSE-SU-2026:1322-1 | Apr 14, 2026 |
| MozillaFirefox · sles 16.0 | 140.9.1-160000.1.1 | SUSE-SU-2026:21157-1 | Apr 9, 2026 |
| MozillaThunderbird · sles 15.7 | 140.9.1-150200.8.266.1 | SUSE-SU-2026:1379-1 | Apr 16, 2026 |
| firefox · RHEL 10 | 140.9.1-1.el10_0 | RHSA-2026:13665 | Apr 15, 2026 |
| firefox · RHEL 8 | 0:140.9.1-1.el8_10 | RHSA-2026:8052 | Apr 15, 2026 |
| firefox · RHEL 9 | 0:140.9.1-1.el9_7 | RHSA-2026:7671 | Apr 15, 2026 |
| firefox · almalinux 10 | 140.9.1-1.el10_1 | ALSA-2026:7672 | Apr 13, 2026 |
| firefox · almalinux 8 | 140.9.1-1.el8_10.alma.1 | ALSA-2026:8052 | Apr 14, 2026 |
| firefox · almalinux 9 | 140.9.1-1.el9_7.alma.1 | ALSA-2026:7671 | Apr 13, 2026 |
| firefox · amzn 2023 | 140.9.1-1.amzn2023.0.1 | ALAS2023-2026-1621 | Apr 27, 2026 |
| firefox · ol 10 | 0:140.9.1-1.0.1.el10_1 | ELSA-2026-7672 | Apr 13, 2026 |
| firefox · ol 8 | 0:140.9.1-1.0.1.el8_10 | ELSA-2026-8052 | Apr 14, 2026 |
| firefox · ol 9 | 0:140.9.1-1.0.1.el9_7 | ELSA-2026-7671 | Apr 13, 2026 |
| firefox · rocky 10 | 0:140.9.1-1.el10_1 | RLSA-2026:7672 | Apr 15, 2026 |
| firefox · rocky 8 | 0:140.9.1-1.el8_10 | RLSA-2026:8052 | Apr 16, 2026 |
| firefox · rocky 9 | 0:140.9.1-1.el9_7 | RLSA-2026:7671 | Apr 15, 2026 |
| firefox-debuginfo · amzn 2023 | 140.9.1-1.amzn2023.0.1 | ALAS2023-2026-1621 | Apr 27, 2026 |
| firefox-debugsource · amzn 2023 | 140.9.1-1.amzn2023.0.1 | ALAS2023-2026-1621 | Apr 27, 2026 |
| firefox-esr · Debian 12.15 (bookworm) | 140.9.1esr-1~deb12u1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| firefox-esr · Debian 13.5 (trixie) | 140.9.1esr-1~deb13u1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| firefox-esr · Debian 14 | 140.9.1esr-1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| firefox-x11 · RHEL 9 | 0:140.9.1-1.el9_7 | RHSA-2026:7671 | Apr 15, 2026 |
| firefox-x11 · almalinux 9 | 140.9.1-1.el9_7.alma.1 | ALSA-2026:7671 | Apr 13, 2026 |
| firefox-x11 · ol 9 | 0:140.9.1-1.0.1.el9_7 | ELSA-2026-7671 | Apr 13, 2026 |
| thunderbird · Debian 12.15 (bookworm) | 1:140.9.1esr-1~deb12u1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:140.9.1esr-1~deb13u1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| thunderbird · Debian 14 | 1:140.9.1esr-1 | DEBIAN-CVE-2026-5731 | Apr 7, 2026 |
| thunderbird · RHEL 10 | 140.9.1-1.el10_0 | RHSA-2026:11813 | Apr 30, 2026 |
| thunderbird · RHEL 8 | 0:140.9.1-1.el8_10 | RHSA-2026:9345 | Apr 30, 2026 |
| thunderbird · RHEL 9 | 0:140.9.1-1.el9_7 | RHSA-2026:8459 | Apr 30, 2026 |
| thunderbird · almalinux 10 | 140.9.1-1.el10_1.alma.1 | ALSA-2026:9638 | Apr 22, 2026 |
| thunderbird · almalinux 8 | 140.9.1-1.el8_10.alma.1 | ALSA-2026:9345 | Apr 21, 2026 |
| thunderbird · almalinux 9 | 140.9.1-1.el9_7.alma.1 | ALSA-2026:8459 | Apr 16, 2026 |
| thunderbird · ol 10 | 0:140.9.1-1.0.1.el10_1 | ELSA-2026-9638 | Apr 22, 2026 |
| thunderbird · ol 8 | 0:140.9.1-1.0.1.el8_10 | ELSA-2026-9345 | Apr 21, 2026 |
| thunderbird · ol 9 | 0:140.9.1-1.0.1.el9_7 | ELSA-2026-8459 | Apr 16, 2026 |
| thunderbird · rocky 10 | 0:140.9.1-1.el10_1 | RLSA-2026:9638 | Apr 24, 2026 |
| thunderbird · rocky 8 | 0:140.9.1-1.el8_10 | RLSA-2026:9345 | Apr 23, 2026 |
| thunderbird · rocky 9 | 0:140.9.1-1.el9_7 | RLSA-2026:8459 | Apr 19, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.