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CVE-2026-2447 is a heap-based buffer overflow in libvpx, a library implementing the VP8 and VP9 video codecs. Processing specially crafted video data can corrupt heap memory, potentially causing application crashes or arbitrary code execution. Affected Mozilla releases include Firefox before 147.0.4, Firefox ESR before 140.7.1 on the 140 branch and before 115.32.1 on the 115 branch, and Thunderbird before 140.7.2 on the 140 branch and before 147.0.2 on the 147 branch. Applications using vulnerable system libvpx packages are also affected.
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No public exploit code observed for this vulnerability.
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32 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap buffer overflow in libvpx affecting Firefox, Firefox ESR, and Thunderbird. The advisory assigns a CVSS v3 base score of 7.5, with network-based exploitation requiring high attack complexity and user interaction. The plugin recommends updating firefox-esr and related packages to version 140.8.0esr-1~deb13u1 or later.
Heap buffer overflow affecting libvpx.
A heap buffer overflow in libvpx, fixed in specified Firefox, Firefox ESR, and Thunderbird releases.
A high-severity heap buffer overflow in the libvpx video codec library used by Firefox for VP8/VP9 decoding, potentially enabling remote code execution via crafted video/media content or malicious web pages.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.