CVE-2026-58049

HIGH SEVERITY

CVSS Score & Metrics

Base Score

8.6 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H                                    

Vulnerability 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.

Vulnerability Details

Published Date

June 28, 2026

Last Modified

June 28, 2026

CWE ID

CWE-787

Source

NVD

Vendor

FFmpeg

Product

FFmpeg

External References

https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c
https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc
https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta

CVE-2026-58049

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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