CVE-2026-58049

High

Description

FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.

SeverityHigh

CVSS8.6

Exploit probability—

ProductFFmpeg

PublishedJun 28, 2026

First seenJun 28, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Vendor advisories

Affected products

Product	Affected versions	Fixed in
FFmpeg FFmpeg	v ≤ bcd2c69e087a09b07cf45c6bd2428ee1ccb2925c	—

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