Name: CVE-2026-38347: Heap-based Buffer Overflow
Creator: Rapid7
Published: 2026-08-28T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-38347, CWE-122, CVSS 7.5, EPSS 0.00458

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 Details

CVSS 3.1 Base Score: 7.5
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Debian	—	Upgrade ffmpeg	Sep 1, 2026	Sep 1, 2026
Ubuntu	—	Upgrade libavformat-ffmpeg56 (Ubuntu Pro)Upgrade libavformat57 (Ubuntu Pro)Upgrade libav-tools (Ubuntu Pro)Upgrade libavfilter-extra6 (Ubuntu Pro)Upgrade libavformat62 (Ubuntu Pro)Upgrade libavformat-extra62 (Ubuntu Pro)Upgrade libavfilter-extra7 (Ubuntu Pro)Upgrade libavcodec-extra57 (Ubuntu Pro)Upgrade libavcodec-extra60 (Ubuntu Pro)Upgrade libavfilter-extra9 (Ubuntu Pro)Upgrade libavfilter-extra11 (Ubuntu Pro)Upgrade libavformat58 (Ubuntu Pro)Upgrade libavcodec-extra62 (Ubuntu Pro)Upgrade libavformat-extra60 (Ubuntu Pro)Upgrade libavcodec-extra58 (Ubuntu Pro)Upgrade libavfilter9 (Ubuntu Pro)Upgrade libavcodec57 (Ubuntu Pro)Upgrade libavcodec-ffmpeg56 (Ubuntu Pro)Upgrade libavcodec58 (Ubuntu Pro)Upgrade libavformat-extra58 (Ubuntu Pro)Upgrade libavcodec62 (Ubuntu Pro)Upgrade ffmpeg (Ubuntu Pro)Upgrade libavfilter-ffmpeg5 (Ubuntu Pro)Upgrade libavformat60 (Ubuntu Pro)Upgrade libavfilter7 (Ubuntu Pro)Upgrade libavcodec60 (Ubuntu Pro)Upgrade libavfilter11 (Ubuntu Pro)Upgrade libavfilter6 (Ubuntu Pro)Upgrade libavcodec-ffmpeg-extra56 (Ubuntu Pro)	Oct 13, 2026	Oct 12, 2026

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CVSS Details

Covered by Rapid7

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