CVE-2026-125176

LOW 3.3

FFmpeg through 9.0.2 Uninitialized Memory Read in Flash Screen Video 2 Decoder

CVSS Score

3.3

EPSS Score

0.0%

EPSS Percentile

0th

FFmpeg through 9.0.2 contains an uninitialized memory read vulnerability in decode_hybrid() in libavcodec/flashsv.c that reads past decompressed data when decoding 15-bit color pixels. Attackers can supply a crafted Flash Screen Video 2 block whose inflated data ends mid-pixel to leak heap memory into decoded output frames.

CWE	CWE-908
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:L/I:N/A:N

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

FFmpeg / FFmpeg

0 ≤ 9.0.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

code.ffmpeg.org: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24474 github.com: https://github.com/FFmpeg/FFmpeg/commit/16d0f7f408ba47b4091a22109d4f22f5fd57820a github.com: https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/flashsv.c#L89 github.com: https://github.com/FFmpeg/FFmpeg vulncheck.com: https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-read-in-flash-screen-video-2-decoder

Credits

zhang xingxing 🔍 Joshua Rogers (AISLE Research) Michael Niedermayer