CVE-2026-125206 (CVSS 2.5)

Description

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the prores_ks encoder's get_alpha_data() that reads before the blocks buffer for interlaced frames with odd heights. Attackers can supply video with alpha and odd height encoded to interlaced ProRes 4444, causing out-of-bounds memory to be encoded into the output alpha plane.

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CVSS v3.1 Score

2.5

LOW

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

EPSS — Exploit Prediction

0.0012

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-127 CWE-127

References

Other References

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24490 https://github.com/FFmpeg/FFmpeg https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/proresenc_kostya.c#L150 https://github.com/FFmpeg/FFmpeg/commit/9edd06f8612c242b83bf9e3d14aa85180015a211 https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-out-of-bounds-read-via-prores-ks-interlaced-alpha-encoding

Frequently Asked Questions

What is CVE-2026-125206? +

FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the prores_ks encoder's get_alpha_data() that reads before the blocks buffer for interlaced frames with odd heights. Attackers can supply video with alpha and odd height encoded to interlaced ProRes 4444, causing out-of-bounds memory to be encoded into the output alpha plane. It has a CVSS v3.1 base score of 2.5 (LOW).

How severe is CVE-2026-125206? +

CVE-2026-125206 has a CVSS v3.1 score of 2.5 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-125206? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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