Skip to content
Fencer Vulns
medium 5.4

CVE-2026-18393 json

Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor

published 2026-08-28 2 mo ago modified 2026-08-28 2 mo ago also EUVD-2026-67655

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • ffmpeg Debian 14 7:8.1.1-1

debian advisories DEBIAN-CVE-2026-18393

  • ffmpeg-7 openSUSE Tumbleweed 7.1.5-4.1
  • ffmpeg-4 openSUSE Tumbleweed 4.4.8-6.1
  • ffmpeg-8 openSUSE Tumbleweed 8.1.2-5.1
  • ffmpeg-9 openSUSE Tumbleweed 9.0.1-6.1

opensuse advisories openSUSE-SU-2026:12108-1openSUSE-SU-2026:12064-1openSUSE-SU-2026:11794-1openSUSE-SU-2026:11795-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18393 updated cvss 5.4

ffmpeg: ffmpeg: Heap buffer overflow in tdsc_load_cursor() via CUR_FMT_MONO cursor

  • Red Hat Enterprise Linux AI (RHEL AI) 3 ffmpeg Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9
    affected: workaround, no fix available “Avoid opening untrusted TDSC-encoded video content with vulnerable FFmpeg consumers until a patched version is available.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.