2569563 – (CVE-2026-125221) CVE-2026-125221 ffmpeg: ffmpeg: Denial of Service via uncontrolled recursion in FLAC parser

Bug 2569563 (CVE-2026-125221) - CVE-2026-125221 ffmpeg: ffmpeg: Denial of Service via uncontrolled recursion in FLAC parser

Summary: CVE-2026-125221 ffmpeg: ffmpeg: Denial of Service via uncontrolled recursion ...

Keywords:
Status:	NEW
Alias:	CVE-2026-125221
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Product Security DevOps Team
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2026-11-10 13:04 UTC by OSIDB Bzimport
Modified:	2026-11-10 13:30 UTC (History)
CC List:	1 user (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Description OSIDB Bzimport 2026-11-10 13:04:11 UTC

FFmpeg through 9.0.2 contains an uncontrolled recursion vulnerability in score_header() in libavcodec/flac_parser.c that allows attackers to exhaust the thread stack via crafted FLAC input. Attackers can supply a FLAC stream packed with many small valid-looking frame headers, forcing deep recursion that crashes the process during demuxing or parsing.

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