Critical [CVE-2026-75143] FFmpeg Heap Buffer Overflow via RIST Protocol Reader
This critical-severity Red Hat Linux advisory covers CVE-2026-75143.
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Summary
A flaw was found in FFmpeg. A heap buffer overflow in the RIST protocol reader allows a remote attacker to trigger memory corruption by sending an oversized packet to an FFmpeg instance receiving a RIST stream.
The librist_read() function ignores its buffer size argument, copying the full payload into the caller-provided buffer without bounds checking. This could lead to denial of service or arbitrary code execution.
The ffmpeg package is not shipped in base Red Hat Enterprise Linux. It is available through EPEL and Fedora with librist support enabled.
Red Hat OpenShift AI container images do not directly install FFmpeg. Exploitation requires the victim to be actively receiving a RIST stream, which is a niche broadcast video protocol not used in typical RH product deployments.
Red Hat severity: Critical — CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-120.
Red Hat lists Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI) as not affected.
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 52 minutes 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 52 minutes ago·verify at source
Mitigation checklist
- No mitigation is currently available for this flaw.
Official advisory · high-confidence parse· fetched 52 minutes ago·verify at source
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