CVE-2026-75141

High

Description

FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.

SeverityHigh

CVSS7.8

Exploit probability—

ProductFFmpeg

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-122CWE-122

How to fix

Update

FFmpeg FFmpegacf5d7cdc1f9ae8752c23e1ea8d7f355ed780781 or later

Patches

code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781

Affected products

Product	Affected versions	Fixed in
FFmpeg FFmpeg	v < acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781	acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781

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