5.4

CVE-2026-18393: ffmpeg Out-of-bounds Write

CVSS: 5.4v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-18393DEBIAN-CVE-2026-18393openSUSE-SU-2026:11795-1
Published 28-08-2026Last modified 28-08-2026
Open JSON

Vulnerability summary

CVE-2026-18393 is a medium (CVSS 5.4) Out-of-bounds Write vulnerability in ffmpeg. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.4% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:11794-1OPENSUSE-SU-2026:12064-1OPENSUSE-SU-2026:12108-1

Timeline

  1. 28-08-2026
    PublishedVulnerability first disclosed.
  2. 28-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • ffmpegAll versions (No fix recorded)
  • libavAll versions (No fix recorded)
Debian1 product
  • ffmpegAll versions (No fix recorded) | < 7:8.1.1-1
Opensuse1 product
  • ffmpeg-9&distro=openSUSE Tumbleweed< 9.0.1-6.1

3 vendors · 4 products

References

8 links