Linux · 
Red Hat · Security advisory · April 30, 2026
Red Hat · Security advisory · April 30, 2026RHSA-2026:11813: thunderbird security update
RHSA-2026:11813, released April 30, 2026, fixes 5 CVEs in thunderbird (version 140.9.1-1.el10_0). None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
5
None rated Critical
Exploited
0
None reported
Highest CVSS
9.8
Base score, 0 to 10
Highest EPSS
0.0107
65th percentile
Priority of the 5 CVEs
Patch now 0
Urgent 0
High 5
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| thunderbird | RHEL 10 | 140.9.1-1.el10_0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-33416 | LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` | 8.8 | 0.0107 | None reported |
| High | CVE-2026-33636 | LIBPNG has ARM NEON Palette Expansion Out-of-Bounds Read on AArch64 | 8.8 | 0.0075 | None reported |
| High | CVE-2026-5732 | Incorrect boundary conditions, integer overflow in the Graphics: Text component | 8.8 | 0.0036 | None reported |
| High | 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 | 9.8 | 0.0035 | None reported |
| High | CVE-2026-5734 | Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2 | 9.8 | 0.0034 | None reported |
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