Division by Zero Vulnerability in FFmpeg VVC Decoder from FFmpeg
CVE-2026-125254

6.8MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125254?

FFmpeg is affected by a division by zero vulnerability found in its VVC decoder. The issue arises when the function ff_vvc_slice_rpl() fails to validate the number of active reference indices against the built reference list entries. This flaw allows attackers to create a malicious VVC bitstream that contains excessive reference indices, leading to a zero Presentation Order Count (POC) difference in the function ff_vvc_mv_scale(). As a result, the decoding process may crash, potentially impacting the integrity and availability of services relying on FFmpeg for media processing.

Affected Version(s)

FFmpeg 0 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25572
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/8732d7585cd8ab9d1...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/v...
technical-description

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
Michael Niedermayer
.