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CVE-2026-39218 is a heap buffer overflow vulnerability in FFmpeg's DASH demuxer. The flaw was reportedly introduced in 2017 and affects FFmpeg media parsing functionality within the DASH demuxing path. A crafted DASH media input can trigger out-of-bounds writes to heap memory during demuxer processing, leading to memory corruption. As a parser-side memory safety flaw in a widely deployed media framework, the vulnerability is relevant anywhere FFmpeg processes attacker-controlled or untrusted DASH content, whether directly through command-line use or indirectly through applications and services embedding FFmpeg.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Heap buffer overflow vulnerability in FFmpeg's DASH demuxer.
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.