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Vulnerability · Published Aug 28, 2026 · Assigned by redhat

CVE-2026-18393Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor

Medium 5.4

In plain English

A medium-severity out-of-bounds write in Red Hat Enterprise Linux AI (RHEL AI) 3 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.4%top 70.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12ffmpegno fix listedDEBIAN-CVE-2026-18393
Debian:13ffmpegno fix listedDEBIAN-CVE-2026-18393
Debian:14ffmpeg7:8.1.1-1DEBIAN-CVE-2026-18393
Ubuntu:26.10ffmpegno fix listedUBUNTU-CVE-2026-18393

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 see references
Red Hat Red Hat OpenShift AI (RHOAI) see references

Weakness: CWE-787 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

References