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CVE-2026-75146

high CVSS 8.1 EPSS 0.3%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-75146 applies to, and the release that fixes it where the sources name one.

ffmpeg 58.35.100.0

At a glance

Severity
High
CVSS base score
8.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 17% of scored vulnerabilities
Weakness
CWE-125
Published
2026-08-19
NVD CVE.org

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