CVE-2026-125229
FFmpeg through 9.0.2 Out-of-Bounds Memory Access in Huffyuv/FFVHUFF Median Predictor
FFmpeg through 9.0.2 contains an out-of-bounds memory access vulnerability in the encode_frame() function of libavcodec/huffyuvenc.c, because encode_init() never validates minimum frame dimensions for the median predictor. Attackers can supply a tiny video, such as a 2-pixel-wide or 1-2-pixel-tall frame, that causes negative sub_median_pred lengths and out-of-bounds reads and writes when transcoded to huffyuv or ffvhuff, crashing the encoder.
Public vulnerability details
- Record state
- Published
- Published (UTC)
- Last updated (UTC)
- Assigned by
- VulnCheck
- CVSS score
- 8.5 (CVSS v4.0, from VulnCheck)
- Severity
- HIGH
- CISA KEV
- No KEV entry in this record. This does not show that the CVE is absent from the KEV catalog.
- Additional data from
- None
FHE assessment
No FHE assessment is available in this application yet. This does not mean FHE cannot mitigate an impact of this CVE.
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25573 (VulnCheck)
- Patch Commit (VulnCheck)
- https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/huffyuvenc.c#L762 (VulnCheck)
- https://github.com/FFmpeg/FFmpeg (VulnCheck)
- VulnCheck Advisory: FFmpeg through 9.0.2 Out-of-Bounds Memory Access in Huffyuv/FFVHUFF Median Predictor (VulnCheck)
Source
CVE JSON 5.2 record from the CVE List archive 2026-11-09_delta_CVEs_at_end_of_day.zip, which covers changes through . Imported .