Buffer overflow in Red Hat Enterprise Linux Ai (Rhel Ai) 3

CVE-2026-18393

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.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (15.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-18393: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18393?
CVE-2026-18393 is a medium-severity vulnerability in Red Hat Enterprise Linux Ai (Rhel Ai) 3, classified under Out-of-bounds Write. CVSS score: 5.4/10. Published 2026-08-28.
How severe is CVE-2026-18393?
Medium severity. CVSS v3 base score is 5.4 out of 10.