CVE-2026-38347

ffmpeg: FFmpeg: Heap overflow vulnerability leads to Denial of Service

Published Aug 27, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

No data.

Vendor Product Versions

Ffmpeg

Version	Status	Scheme	Platform
`722a217`	affected	code_commit	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Ubuntu USN	USN-8915-1	FFmpeg vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.458% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://nvd.nist.gov/vuln/detail/CVE-2026-38347
https://trac.ffmpeg.org/ticket/11692
https://www.cve.org/CVERecord?id=CVE-2026-38347

History

Aug 31, 2026 6:30 PM Weaknesses updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-122
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}`	ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}` cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Aug 28, 2026 4:45 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-122

Aug 28, 2026 12:15 PM Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Title	Heap Overflow in FFmpeg's libswscale Causes Denial of Service	ffmpeg: FFmpeg: Heap overflow vulnerability leads to Denial of Service
Weaknesses		CWE-787
References		https://nvd.nist.gov/vuln/detail/CVE-2026-38347 https://www.cve.org/CVERecord?id=CVE-2026-38347
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Aug 28, 2026 6:45 AM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title		Heap Overflow in FFmpeg's libswscale Causes Denial of Service
Weaknesses		CWE-122

Aug 28, 2026 6:15 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Ffmpeg Ffmpeg ffmpeg
Vendors & Products		Ffmpeg Ffmpeg ffmpeg

Aug 27, 2026 6:00 PM Description updated. Added references View changes

Type	Values Removed	Values Added
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.
References		https://trac.ffmpeg.org/ticket/11692