CVE-2026-38347

Received Received - Intake

Heap Overflow in FFmpeg via Crafted Input

Publication date: 2026-08-28

Last updated on: 2026-08-31

Assigner: MITRE

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 Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-28

Last Modified

2026-08-31

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-38347

EUVD

EUVD-2026-67320

Affected Vendors & Products

Vendor	Product	Version / Range
ffmpeg	ffmpeg	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap overflow vulnerability in the ff_sws_alphablendaway function within the libswscale/alphablend.c component of FFmpeg. It occurs due to improper memory handling when processing crafted input data, potentially leading to a Denial of Service (DoS) condition.

Impact Analysis

The vulnerability allows attackers to cause a system crash or freeze by exploiting the heap overflow, resulting in a Denial of Service. This could disrupt media processing tasks, streaming services, or any application relying on FFmpeg for video or audio processing.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a technical DoS issue in FFmpeg's libswscale component. Compliance impacts would depend on how the affected software is used in systems handling regulated data.

Mitigation Strategies

Update FFmpeg to the latest version to patch the heap overflow in ff_sws_alphablendaway. Avoid processing untrusted media files until patched.

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