CVE-2026-125175

LowCVSS 3.3/10Last modified Nov 10, 2026

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.

Metrics

CVSS 3.1 3.3/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-908

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

No affected versions have been published.

Timeline

Published
Nov 9, 2026
Last modified
Nov 10, 2026
NVD status
Awaiting Analysis

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CVE-2026-125175: Low severity, CVSS 3.3 | Vulnix