7.5

CVE-2026-38347: ffmpeg Heap-based Buffer Overflow

CVSS: 7.5v3.1HighDeferred
AliasesUBUNTU-CVE-2026-38347DEBIAN-CVE-2026-38347
Published 27-08-2026Last modified 31-08-2026
Open JSON

Vulnerability summary

CVE-2026-38347 is a high (CVSS 7.5) Heap-based Buffer Overflow vulnerability in ffmpeg. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2026:11794-1OPENSUSE-SU-2026:12064-1OPENSUSE-SU-2026:12108-1USN-8915-1

Timeline

  1. 27-08-2026
    PublishedVulnerability first disclosed.
  2. 31-08-2026
    Last modifiedVulnerability information updated.

Description

A heap overflow in the ff_sws_alphablendaway function (libswscale/alphablend.c) of FFmpeg git-master commit 722a217 allows attackers to cause a Denial of Service (DoS) via a crafted input.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

+0.13 pp

From 0.33% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.46%

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) | < 7:2.8.17-0ubuntu0.1+esm18 | < 7:3.4.11-0ubuntu0.1+esm16 | < 7:4.2.7-0ubuntu0.1+esm18 | < 7:4.4.2-0ubuntu0.22.04.1+esm17 | < 7:6.1.1-3ubuntu5+esm15
  • libavAll versions (No fix recorded)
Debian1 product
  • ffmpegAll versions (No fix recorded) | < 7:7.1.5-0+deb13u1 | < 7:8.0.1-2

2 vendors · 3 products

References

6 links