Cloudanix VulnDB

CVE-2026-75143

Critical · 9.8

CVSS

9.8

EPSS

0.7%

Published

Aug 19, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed

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