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CVE-2026-39217 is a heap buffer overflow vulnerability in FFmpeg's VP9 decoder. The issue is described as a regression introduced in March 2025. Successful exploitation occurs when the decoder processes attacker-controlled VP9 media data and performs an out-of-bounds write on heap-allocated memory. As a memory corruption flaw in a media parsing and decoding path, the vulnerability can be triggered during handling of crafted VP9 content by applications or services that rely on FFmpeg for decoding.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Heap buffer overflow vulnerability in FFmpeg's VP9 decoder.
One of nine FFmpeg vulnerabilities identified by an autonomous AI agent; the FFmpeg findings are described as mostly heap or stack overflows in parsers and demuxers.
One of nine CVE-backed FFmpeg vulnerabilities in a campaign spanning demuxers, muxers, codecs, RTP handling, scaling, and command-line parsing.
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.