High [CVE-2026-75146] Information disclosure and denial of service via out-of-bounds read in DASH demuxer
This high-severity Red Hat Linux advisory covers CVE-2026-75146 affecting Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI).
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Summary
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.
A flaw was found in FFmpeg. A malicious or misconfigured DASH (Dynamic Adaptive Streaming over HTTP) server can exploit an out-of-bounds read vulnerability in the DASH demuxer.
Successful exploitation could lead to information disclosure or a denial of service. The ffmpeg package is not shipped in base Red Hat Enterprise Linux.
It is available through EPEL, Red Hat Enterprise Linux AI, and as a bundled dependency in Red Hat OpenShift AI container images. The vulnerable code resides in the DASH demuxer (libavformat/dashdec.c), which is compiled and shipped in all FFmpeg builds across these products.
Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- No mitigation is currently available for this flaw.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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