🔐 CVE Alert

CVE-2025-11719

CRITICAL 9.8

Use-after-free caused by the native messaging web extension API on Windows

CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th

Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Oct 14, 2025
Last Updated Apr 13, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1991950 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-81/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-84/

Credits

Filip Štamcar