Bug 2570723 (CVE-2026-125257) - CVE-2026-125257 ffmpeg: ffmpeg: Arbitrary code execution via crafted Nellymoser audio encoding
Summary: CVE-2026-125257 ffmpeg: ffmpeg: Arbitrary code execution via crafted Nellymos...
Keywords:
Status: NEW
Alias: CVE-2026-125257
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-10 20:17 UTC by OSIDB Bzimport
Modified: 2026-11-10 23:40 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-11-10 20:17:52 UTC 
FFmpeg through 9.0.2 contains an off-by-one heap overflow vulnerability in get_exponent_dynamic() in libavcodec/nellymoserenc.c that allows writing one element past the opt and path allocations. Attackers can supply crafted audio to applications encoding Nellymoser with trellis enabled, causing idx to equal OPT_SIZE and overwrite adjacent heap memory.
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