FFmpeg: VVC decoder heap-based memory corruption (CVE-2026-125251)
FFmpeg through 9.0.2 contains an integer overflow vulnerability in the VVC decoder alloc_frame() function that leads to heap out-of-bounds writes on 32-bit builds.
CVE search metadata
CVE search record: CVE-2026-125251. Severity: high. CVSS: 7.0. KEV: no. Product: FFmpeg (<= 9.0.2). Brief: FFmpeg: VVC decoder heap-based memory corruption (CVE-2026-125251). Brief link: https://feed.craftedsignal.io/briefs/2026-11-ffmpeg-vvc-overflow/
Triage facts
Revision 1- Applicability
- FFmpeg (<= 9.0.2)
- Evidence
- Unknown
- Severity
- High
- Sources
- 1 public source
- Freshness
- Revision 1Nov 9, 19:56 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
FFmpeg through 9.0.2 contains an integer overflow vulnerability in the VVC (H.266) decoder alloc_frame() function in libavcodec/vvc/refs.c. This flaw undersizes the reference picture list allocation on 32-bit builds. An attacker can provide a crafted VVC file with a large number of NAL units per access unit to trigger heap out-of-bounds writes and corrupt memory.