---
id: CVE-2026-38347
title: >-
  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.
summary: >-
  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.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-122
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:42:20.313'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-38347'
references:
  - url: 'https://trac.ffmpeg.org/ticket/11692'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00329
epssPercentile: 0.2627
ingestedAt: '2026-09-08T20:10:03.159Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.