Low severity3.3NVD Advisory· Published Nov 9, 2026

CVE-2026-125101

Description

FFmpeg through 9.0.2 contains an information disclosure vulnerability in the VMnc decoder in libavcodec/vmnc.c that restores an unwritten cursor save area into later frames. Attackers can supply a crafted VMnc stream where a frame fails after loading a cursor shape, causing uninitialized heap bytes from screendta to appear in decoded output.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

FFmpeg/Ffmpegllm-fuzzy
Range: <=9.0.2

Patches

Vulnerability mechanics

References

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25716nvd
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/vmnc.cnvd
github.com/FFmpeg/FFmpeg/commit/50865f20b1f474e6b11735c88f668751bc9aa528nvd
www.vulncheck.com/advisories/ffmpeg-through-9.0.2-vmnc-decoder-uninitialized-heap-memory-disclosurenvd

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cvss	0.214
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000