VULNERABILITY INTELLIGENCE

CVE-2026-75143

CVSS score9.8 CRITICAL
EPSS probability0.70%
CISA KEVNot currently listed
Published2026-08-19
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.

Weakness classification

  • disclosure@vulncheck.com: CWE-122

Primary references