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Vulnerability record · CVE-2026-58049 · published 28 June 2026

CVE-2026-58049: Out-of-bounds write vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.50% · top 59.9% CWE-787 · Out-of-bounds write Awaiting Analysis
8.8CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
14References
1 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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
https://access.redhat.com/errata/RHSA-2026:43711
https://access.redhat.com/errata/RHSA-2026:51180
https://access.redhat.com/errata/RHSA-2026:52832
https://access.redhat.com/errata/RHSA-2026:52833
https://access.redhat.com/errata/RHSA-2026:60520
https://access.redhat.com/errata/RHSA-2026:61627
https://access.redhat.com/errata/RHSA-2026:61628
https://access.redhat.com/errata/RHSA-2026:61629
https://access.redhat.com/security/cve/CVE-2026-58049
https://bugzilla.redhat.com/show_bug.cgi?id=2493952
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58049.json

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Source: NIST National Vulnerability Database (record CVE-2026-58049), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.