CVE-2025-5986

Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links

CVE-2025-5986 is fixed in 139 products on 2 platforms, first by Mozilla Thunderbird (af) 139.0.2, released June 10, 2025. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0061
49th percentile

A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability was fixed in Thunderbird 128.11.1 and Thunderbird 139.0.2.

Where it's fixed

ProductFixed inFixReleased
Windows apps
Mozilla Thunderbird (af) 139.0.2 Mozilla Thunderbird (af) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ar) 139.0.2 Mozilla Thunderbird (ar) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ast) 139.0.2 Mozilla Thunderbird (ast) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (be) 139.0.2 Mozilla Thunderbird (be) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (bg) 139.0.2 Mozilla Thunderbird (bg) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (br) 139.0.2 Mozilla Thunderbird (br) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ca) 139.0.2 Mozilla Thunderbird (ca) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (cak) 139.0.2 Mozilla Thunderbird (cak) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (cs) 139.0.2 Mozilla Thunderbird (cs) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (cy) 139.0.2 Mozilla Thunderbird (cy) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (da) 139.0.2 Mozilla Thunderbird (da) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (de) 139.0.2 Mozilla Thunderbird (de) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (dsb) 139.0.2 Mozilla Thunderbird (dsb) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (el) 139.0.2 Mozilla Thunderbird (el) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (en-CA) 139.0.2 Mozilla Thunderbird (en-CA) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (en-GB) 139.0.2 Mozilla Thunderbird (en-GB) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (en-US) 139.0.2 Mozilla Thunderbird (en-US) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (es-AR) 139.0.2 Mozilla Thunderbird (es-AR) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (es-ES) 139.0.2 Mozilla Thunderbird (es-ES) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (es-MX) 139.0.2 Mozilla Thunderbird (es-MX) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (et) 139.0.2 Mozilla Thunderbird (et) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (eu) 139.0.2 Mozilla Thunderbird (eu) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (fi) 139.0.2 Mozilla Thunderbird (fi) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (fr) 139.0.2 Mozilla Thunderbird (fr) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (fy-NL) 139.0.2 Mozilla Thunderbird (fy-NL) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ga-IE) 139.0.2 Mozilla Thunderbird (ga-IE) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (gd) 139.0.2 Mozilla Thunderbird (gd) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (gl) 139.0.2 Mozilla Thunderbird (gl) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (he) 139.0.2 Mozilla Thunderbird (he) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (hr) 139.0.2 Mozilla Thunderbird (hr) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (hsb) 139.0.2 Mozilla Thunderbird (hsb) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (hu) 139.0.2 Mozilla Thunderbird (hu) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (hy-AM) 139.0.2 Mozilla Thunderbird (hy-AM) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (id) 139.0.2 Mozilla Thunderbird (id) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (is) 139.0.2 Mozilla Thunderbird (is) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (it) 139.0.2 Mozilla Thunderbird (it) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ja) 139.0.2 Mozilla Thunderbird (ja) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ka) 139.0.2 Mozilla Thunderbird (ka) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (kab) 139.0.2 Mozilla Thunderbird (kab) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (kk) 139.0.2 Mozilla Thunderbird (kk) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ko) 139.0.2 Mozilla Thunderbird (ko) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (lt) 139.0.2 Mozilla Thunderbird (lt) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (lv) 139.0.2 Mozilla Thunderbird (lv) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ms) 139.0.2 Mozilla Thunderbird (ms) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (nb-NO) 139.0.2 Mozilla Thunderbird (nb-NO) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (nl) 139.0.2 Mozilla Thunderbird (nl) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (nn-NO) 139.0.2 Mozilla Thunderbird (nn-NO) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (pa-IN) 139.0.2 Mozilla Thunderbird (pa-IN) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (pl) 139.0.2 Mozilla Thunderbird (pl) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (pt-BR) 139.0.2 Mozilla Thunderbird (pt-BR) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (pt-PT) 139.0.2 Mozilla Thunderbird (pt-PT) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (rm) 139.0.2 Mozilla Thunderbird (rm) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ro) 139.0.2 Mozilla Thunderbird (ro) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (ru) 139.0.2 Mozilla Thunderbird (ru) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (sk) 139.0.2 Mozilla Thunderbird (sk) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (sl) 139.0.2 Mozilla Thunderbird (sl) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (sq) 139.0.2 Mozilla Thunderbird (sq) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (sr) 139.0.2 Mozilla Thunderbird (sr) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (sv-SE) 139.0.2 Mozilla Thunderbird (sv-SE) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (th) 139.0.2 Mozilla Thunderbird (th) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (tr) 139.0.2 Mozilla Thunderbird (tr) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (uk) 139.0.2 Mozilla Thunderbird (uk) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (uz) 139.0.2 Mozilla Thunderbird (uz) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (vi) 139.0.2 Mozilla Thunderbird (vi) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (zh-CN) 139.0.2 Mozilla Thunderbird (zh-CN) 139.0.2 Jun 10, 2025
Mozilla Thunderbird (zh-TW) 139.0.2 Mozilla Thunderbird (zh-TW) 139.0.2 Jun 10, 2025
Mozilla Thunderbird ESR (af) 128.11.1 Mozilla Thunderbird ESR (af) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ar) 128.11.1 Mozilla Thunderbird ESR (ar) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ast) 128.11.1 Mozilla Thunderbird ESR (ast) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (be) 128.11.1 Mozilla Thunderbird ESR (be) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (bg) 128.11.1 Mozilla Thunderbird ESR (bg) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (br) 128.11.1 Mozilla Thunderbird ESR (br) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ca) 128.11.1 Mozilla Thunderbird ESR (ca) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (cak) 128.11.1 Mozilla Thunderbird ESR (cak) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (cs) 128.11.1 Mozilla Thunderbird ESR (cs) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (cy) 128.11.1 Mozilla Thunderbird ESR (cy) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (da) 128.11.1 Mozilla Thunderbird ESR (da) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (de) 128.11.1 Mozilla Thunderbird ESR (de) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (dsb) 128.11.1 Mozilla Thunderbird ESR (dsb) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (el) 128.11.1 Mozilla Thunderbird ESR (el) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (en-CA) 128.11.1 Mozilla Thunderbird ESR (en-CA) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (en-GB) 128.11.1 Mozilla Thunderbird ESR (en-GB) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (en-US) 128.11.1 Mozilla Thunderbird ESR (en-US) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (es-AR) 128.11.1 Mozilla Thunderbird ESR (es-AR) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (es-ES) 128.11.1 Mozilla Thunderbird ESR (es-ES) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (es-MX) 128.11.1 Mozilla Thunderbird ESR (es-MX) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (et) 128.11.1 Mozilla Thunderbird ESR (et) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (eu) 128.11.1 Mozilla Thunderbird ESR (eu) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (fi) 128.11.1 Mozilla Thunderbird ESR (fi) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (fr) 128.11.1 Mozilla Thunderbird ESR (fr) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (fy-NL) 128.11.1 Mozilla Thunderbird ESR (fy-NL) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ga-IE) 128.11.1 Mozilla Thunderbird ESR (ga-IE) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (gd) 128.11.1 Mozilla Thunderbird ESR (gd) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (gl) 128.11.1 Mozilla Thunderbird ESR (gl) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (he) 128.11.1 Mozilla Thunderbird ESR (he) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (hr) 128.11.1 Mozilla Thunderbird ESR (hr) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (hsb) 128.11.1 Mozilla Thunderbird ESR (hsb) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (hu) 128.11.1 Mozilla Thunderbird ESR (hu) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (hy-AM) 128.11.1 Mozilla Thunderbird ESR (hy-AM) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (id) 128.11.1 Mozilla Thunderbird ESR (id) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (is) 128.11.1 Mozilla Thunderbird ESR (is) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (it) 128.11.1 Mozilla Thunderbird ESR (it) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ja) 128.11.1 Mozilla Thunderbird ESR (ja) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ka) 128.11.1 Mozilla Thunderbird ESR (ka) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (kab) 128.11.1 Mozilla Thunderbird ESR (kab) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (kk) 128.11.1 Mozilla Thunderbird ESR (kk) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ko) 128.11.1 Mozilla Thunderbird ESR (ko) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (lt) 128.11.1 Mozilla Thunderbird ESR (lt) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (lv) 128.11.1 Mozilla Thunderbird ESR (lv) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ms) 128.11.1 Mozilla Thunderbird ESR (ms) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (nb-NO) 128.11.1 Mozilla Thunderbird ESR (nb-NO) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (nl) 128.11.1 Mozilla Thunderbird ESR (nl) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (nn-NO) 128.11.1 Mozilla Thunderbird ESR (nn-NO) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (pa-IN) 128.11.1 Mozilla Thunderbird ESR (pa-IN) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (pl) 128.11.1 Mozilla Thunderbird ESR (pl) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (pt-BR) 128.11.1 Mozilla Thunderbird ESR (pt-BR) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (pt-PT) 128.11.1 Mozilla Thunderbird ESR (pt-PT) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (rm) 128.11.1 Mozilla Thunderbird ESR (rm) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ro) 128.11.1 Mozilla Thunderbird ESR (ro) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (ru) 128.11.1 Mozilla Thunderbird ESR (ru) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (sk) 128.11.1 Mozilla Thunderbird ESR (sk) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (sl) 128.11.1 Mozilla Thunderbird ESR (sl) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (sq) 128.11.1 Mozilla Thunderbird ESR (sq) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (sr) 128.11.1 Mozilla Thunderbird ESR (sr) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (sv-SE) 128.11.1 Mozilla Thunderbird ESR (sv-SE) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (th) 128.11.1 Mozilla Thunderbird ESR (th) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (tr) 128.11.1 Mozilla Thunderbird ESR (tr) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (uk) 128.11.1 Mozilla Thunderbird ESR (uk) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (uz) 128.11.1 Mozilla Thunderbird ESR (uz) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (vi) 128.11.1 Mozilla Thunderbird ESR (vi) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (zh-CN) 128.11.1 Mozilla Thunderbird ESR (zh-CN) 128.11.1 Jun 10, 2025
Mozilla Thunderbird ESR (zh-TW) 128.11.1 Mozilla Thunderbird ESR (zh-TW) 128.11.1 Jun 10, 2025
Linux
MozillaThunderbird · opensuse-leap 15.6 128.11.1-150200.8.224.1 SUSE-SU-2025:02158-1 Jun 27, 2025
MozillaThunderbird · sles 15.6 128.11.1-150200.8.224.1 SUSE-SU-2025:02158-1 Jun 27, 2025
MozillaThunderbird · sles 15.7 128.11.1-150200.8.224.1 SUSE-SU-2025:02158-1 Jun 27, 2025
thunderbird · Debian 11.6 (bullseye) 1:128.12.0esr-1~deb11u1 DLA-4239-1 Jul 11, 2025
thunderbird · Debian 12.15 (bookworm) 1:128.12.0esr-1~deb12u1 DSA-5959-1 Jul 6, 2025
thunderbird · Debian 13.5 (trixie) 1:128.12.0esr-1 DEBIAN-CVE-2025-5986 Jun 11, 2025
thunderbird · Debian 14 1:128.12.0esr-1 DEBIAN-CVE-2025-5986 Jun 11, 2025
thunderbird · RHEL 10 128.12.0-1.el10_0 RHSA-2025:10195 Jun 24, 2025
thunderbird · RHEL 8 0:128.12.0-1.el8_10 RHSA-2025:10246 Jul 2, 2025
thunderbird · RHEL 9 0:128.12.0-1.el9_6 RHSA-2025:10196 Jul 2, 2025
thunderbird · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 thunderbird 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025
thunderbird · almalinux 10 128.12.0-1.el10_0.alma.1 ALSA-2025:10195 Jul 2, 2025
thunderbird · almalinux 8 128.12.0-1.el8_10.alma.1 ALSA-2025:10246 Jul 2, 2025
thunderbird · almalinux 9 128.12.0-1.el9_6.alma.1 ALSA-2025:10196 Jul 2, 2025
thunderbird · ol 10 0:128.12.0-1.0.1.el10_0 ELSA-2025-10195 Jul 2, 2025
thunderbird · ol 8 0:128.12.0-1.0.1.el8_10 ELSA-2025-10246 Jul 2, 2025
thunderbird · ol 9 0:128.12.0-1.0.1.el9_6 ELSA-2025-10196 Jul 2, 2025
thunderbird · rocky 10 0:128.12.0-1.el10_0 RLSA-2025:10195 Oct 3, 2025
thunderbird · rocky 8 0:128.12.0-1.el8_10 RLSA-2025:10246 Jul 29, 2025
thunderbird · rocky 9 0:128.12.0-1.el9_6 RLSA-2025:10196 Oct 4, 2025
thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 thunderbird-gnome-support 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025
thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 thunderbird-mozsymbols 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025
xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 xul-ext-calendar-timezones 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025
xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 xul-ext-gdata-provider 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025
xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) 1:128.12.0+build1-0ubuntu0.22.04.1 xul-ext-lightning 1:128.12.0+build1-0ubuntu0.22.04.1 Jun 24, 2025

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