Low severity3.3NVD Advisory· Published Nov 9, 2026
CVE-2026-125175
CVE-2026-125175
Description
FFmpeg through 9.0.2 contains an information disclosure vulnerability in flashsv_decode_block() in libavcodec/flashsv.c that copies uninitialized heap memory into decoded frames when inflate output is short. Attackers can supply a crafted FLV with an FSV1 stream whose zlib block data decompresses short, then recover heap contents from the decoded or re-encoded output.
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Affected products
1Patches
Vulnerability mechanics
References
5- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24464nvd
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/flashsv.cnvd
- github.com/FFmpeg/FFmpeg/commit/50d206a75b5e60261d71b25657ae04891eb60290nvd
- github.com/FFmpeg/FFmpeg/commit/cfb40c912927fdd2c1186b7b6aca468422da23dbnvd
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-information-disclosure-via-flash-screen-video-decodernvd
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