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Vulnerability · Published Feb 16, 2026 · Assigned by mozilla

CVE-2026-2447Heap buffer overflow in libvpx

High 8.8

In plain English

A high-severity heap buffer overflow in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 46.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10firefox140.8.0-2.el10_1ALSA-2026:3361
AlmaLinux:8firefox140.8.0-2.el8_10.alma.1ALSA-2026:3338
AlmaLinux:9firefox140.8.0-2.el9_7.alma.1ALSA-2026:3339
AlmaLinux:9firefox-x11140.8.0-2.el9_7.alma.1ALSA-2026:3339
AlmaLinux:10libvpx1.14.1-6.el10_1ALSA-2026:4629
AlmaLinux:8libvpx1.7.0-13.el8_10ALSA-2026:3967
AlmaLinux:9libvpx1.9.0-10.el9_7ALSA-2026:4447
AlmaLinux:10libvpx-devel1.14.1-6.el10_1ALSA-2026:4629
AlmaLinux:8libvpx-devel1.7.0-13.el8_10ALSA-2026:3967
AlmaLinux:9libvpx-devel1.9.0-10.el9_7ALSA-2026:4447
AlmaLinux:10thunderbird140.8.0-2.el10_1.alma.1ALSA-2026:3517
AlmaLinux:8thunderbird140.8.0-1.el8_10.alma.1ALSA-2026:3515
AlmaLinux:9thunderbird140.8.0-1.el9_7.alma.1ALSA-2026:3516
Debian:12firefox-esr140.8.0esr-1DEBIAN-CVE-2026-2447
Debian:13firefox-esr140.8.0esr-1DEBIAN-CVE-2026-2447
Debian:14firefox-esr140.8.0esr-1DEBIAN-CVE-2026-2447
Debian:12libvpx1.12.0-1+deb12u5DSA-6143-1
Debian:12libvpx1.12.0-1+deb12u5DEBIAN-CVE-2026-2447
Debian:13libvpx1.15.0-2.1+deb13u1DEBIAN-CVE-2026-2447
Debian:13libvpx1.15.0-2.1+deb13u1DSA-6143-1
Debian:14libvpx1.16.0-3DEBIAN-CVE-2026-2447
Debian:12thunderbird1:140.8.0esr-1DEBIAN-CVE-2026-2447
Debian:13thunderbird1:140.8.0esr-1DEBIAN-CVE-2026-2447
Debian:14thunderbird1:140.8.0esr-1DEBIAN-CVE-2026-2447
Rocky Linux:10firefox0:140.8.0-2.el10_1RLSA-2026:3361
Rocky Linux:8firefox0:140.8.0-2.el8_10RLSA-2026:3338
Rocky Linux:9firefox0:140.8.0-2.el9_7RLSA-2026:3339
Rocky Linux:10libvpx0:1.14.1-6.el10_1RLSA-2026:4629
Rocky Linux:8libvpx0:1.7.0-13.el8_10RLSA-2026:3967
Rocky Linux:9libvpx0:1.9.0-10.el9_7RLSA-2026:4447
Rocky Linux:10thunderbird0:140.8.0-2.el10_1RLSA-2026:3517
Rocky Linux:8thunderbird0:140.8.0-1.el8_10RLSA-2026:3515
Rocky Linux:9thunderbird0:140.8.0-1.el9_7RLSA-2026:3516
Ubuntu:22.04:LTSlibvpx1.11.0-2ubuntu2.5UBUNTU-CVE-2026-2447
Ubuntu:24.04:LTSlibvpx1.14.0-1ubuntu2.3UBUNTU-CVE-2026-2447
Ubuntu:25.10libvpx1.15.0-2.1ubuntu0.1UBUNTU-CVE-2026-2447
Ubuntu:26.04:LTSlibvpx1.16.0-2ubuntu1UBUNTU-CVE-2026-2447
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-2447

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References