Heap Out-of-Bounds Read Vulnerability in FFmpeg
CVE-2026-125270

5.8MEDIUM

Key Information:

Vendor

Ffmpeg

Status
Ffmpeg
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125270?

FFmpeg versions up to 9.0.2 have a heap out-of-bounds read vulnerability in the function v4l2_buffer_swframe_to_buf() within libavcodec/v4l2_buffers.c. This flaw occurs when the application mishandles frames that have a negative linesize. Attackers can exploit this vulnerability by supplying specially crafted bottom-up AVI or PNM/PFM files to the V4L2 M2M encoder, potentially leading to application crashes or inadvertent leakage of heap memory into the encoded output.

Affected Version(s)

FFmpeg 0 <= 9.0.2

References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24328
issue-tracking
https://github.com/FFmpeg/FFmpeg/commit/b8f159858e2fd29da...
patch
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/v...
technical-description

CVSS V4

Score:
5.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
Wenjie Yin
.