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8.8
Firefox and Thunderbird: Heap Overflow Can Crash Browser
CVE-2026-2447
Summary
A security issue in the libvpx library used by Firefox and Thunderbird can cause the browser to crash. This affects older versions of Firefox and Thunderbird, and can be fixed by updating to the latest version.
Original title
Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.
Original description
Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.
osv CVSS3.1
8.8
- https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html URL
- https://www.mozilla.org/security/advisories/mfsa2026-10/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-11/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 Third Party Advisory
Published: 16 Feb 2026 · Updated: 13 Mar 2026 · First seen: 13 Mar 2026