CVE-2026-18393 Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor
A heap buffer overflow in FFmpeg allows remote attackers to execute arbitrary code or cause denial of service via crafted video files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-18393?
CVE-2026-18393 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux AI (RHEL AI) 3, published on 28 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-18393?
Linux distribution packages (1)
ffmpeg-9 openSUSE:Tumbleweed | All versions | 9.0.1-6.1 |
How do I fix CVE-2026-18393?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-18393 being exploited?
There is no known exploitation of CVE-2026-18393 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-18393, ECHO-1c69-349a-b2ee, GHSA-2g8r-jjgv-h39x, UBUNTU-CVE-2026-18393, openSUSE-SU-2026:11795-1.