CVE-2026-18393

Severity CVSS v4.0:

Pending analysis

Type:

CWE-787 Out-of-bounds Write

Publication date:

28/08/2026

Last modified:

28/08/2026

Description

A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond<br /> the bounds of a heap-allocated buffer when processing crafted TDSC cursor<br /> data. A remote attacker could exploit this by supplying a specially crafted<br /> video file, potentially leading to a denial of service or arbitrary code<br /> execution.

Impact

Vector 3.x

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.40 MEDIUM
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): High

Base Score 3.x

5.40

Severity 3.x

MEDIUM

References to Advisories, Solutions, and Tools

https://access.redhat.com/security/cve/CVE-2026-18393
https://bugzilla.redhat.com/show_bug.cgi?id=2520309
https://github.com/FFmpeg/FFmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c
https://patchwork.ffmpeg.org/project/ffmpeg/patch/177767065817.63.1948165304485903849@29965ddac10e/