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CVE-2026-39213 is a heap buffer overflow vulnerability in FFmpeg’s yuv4mpegenc component. The issue was reported as having been introduced in 2023. Available information identifies the flaw class and affected component, but does not provide the specific vulnerable function, code path, or triggering input structure. Successful exploitation would involve crafted media-processing input reaching the yuv4mpegenc encoding path and causing an out-of-bounds write on heap-allocated memory.
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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 yuv4mpegenc.
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.