Quick answers
- Is CVE-2026-125242 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-125242 being exploited in the wild.
- How severe is CVE-2026-125242?
- Medium severity, with a CVSS score of 4.7, published 9 November 2026.
- Which products and versions are affected?
- Ffmpeg through 9.0.2.
- Is there a fix for CVE-2026-125242?
- A patch was published on 2026-10-27: Fix merged in pull request #25231 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-125242 attacked?
- It is attacked over the network or with local access.
- Am I affected by CVE-2026-125242?
- Check whether you run Ffmpeg at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A memory leak exists in libavcodec/vdpau.c where the bitstream_buffers table is not freed when pictures are abandoned before the end_frame call. Attackers can supply crafted H.264 streams with malformed NAL units that repeatedly abandon pictures to trigger continuous memory leaks. The vulnerability requires network or local delivery of a malformed video file to a system running vulnerable FFmpeg, and results in denial of service through memory exhaustion.
Affected products
- FFmpeg FFmpeg through 9.0.2
Timeline
- 2026-11-09: disclosed
- 2026-10-27: patched: Fix merged in pull request #25231