CVE-2026-125175
Received Received - Intake

Heap Memory Disclosure in FFmpeg via FLV FSV1 Stream

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: VulnCheck

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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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-125175
EUVD
EUVD-2026-120264

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FFmpeg FFmpeg From 0 (inc) to 9.0.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-908 The product uses or accesses a resource that has not been initialized.

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