Out-of-bounds Read Affecting ffmpeg-7.1 package, versions <7.1.5-r4


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.26% (17th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-FFMPEG71-20361540
  • published1 Oct 2026
  • disclosed19 Aug 2026

Introduced: 19 Aug 2026

CVE-2026-75146  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Chainguard ffmpeg-7.1 to version 7.1.5-r4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ffmpeg-7.1 package and not the ffmpeg-7.1 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the upper bound before indexing the fragments array, allowing a negative index to be used and causing an out-of-bounds read. A malicious or misconfigured DASH server can trigger this by serving a live manifest with a decreasing startNumber across a manifest refresh.

CVSS Base Scores

version 3.1