CVE-2026-125262

HIGH 7.8

FFmpeg through 9.0.2 Heap Buffer Overflow via LCEVC Enhancement Decoding

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/lcevcdec.c because LCEVC output picture dimensions are not validated against the allocated frame. Attackers can embed crafted LCEVC enhancement data with differing global configurations in H.264 or HEVC streams to corrupt heap memory in decoding applications.

CWE	CWE-787
Vendor	ffmpeg
Product	ffmpeg
Published	Nov 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

FFmpeg / FFmpeg

7.1 ≤ 9.0.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

code.ffmpeg.org: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25067 github.com: https://github.com/FFmpeg/FFmpeg/commit/fd6dfa613a48665dcb8d14186b33dad90aa40ae0 github.com: https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/lcevcdec.c#L224 github.com: https://github.com/FFmpeg/FFmpeg vulncheck.com: https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-via-lcevc-enhancement-decoding

Credits

Ayoub Nabil Boubagrat 🔍 Joshua Rogers (AISLE Research) Michael Niedermayer