Heap-based Buffer Overflow Affecting ffmpeg package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-CONAN-FFMPEG-18235322
- published23 Jul 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
NewCVE-2026-64830 (opens in a new tab)How to fix?
There is no fixed version for ffmpeg.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow through the VobSub subtitle demuxer in libavformat/mpeg.c’s vobsub_read_header() and ff_subtitles_queue_insert(). An attacker can corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file that declares more distinct stream IDs than the fixed-size vobsub->q[] array can hold. When the demuxer creates subtitle entries using vobsub->q[s->nb_streams - 1], it can write past the queue bounds as the stream count grows beyond the array size. This can crash applications using FFmpeg to parse VobSub subtitles and can be leveraged for arbitrary code execution.