CVE-2026-58049
FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()
- State
- Published
- Severity
- 8.8 High
- Published
- Jun 28, 2026
- Updated
- Sep 1, 2026
- Reserved
- Jun 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | 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 | VulnCheck |
| 3.1 | 8.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | VulnCheck |
| 3.1 | 7.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H | redhat-SADP |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
FFmpegFFmpeg |
|
References
- Proof of Conceptexploitthird-party-advisory
- libavcodec/rasc.cproduct
- VulnCheck Advisory: FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-58049vdb-entry
- RHBZ#2493952issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58049.json
- https://access.redhat.com/errata/RHSA-2026:52832vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:52833vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:51180vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:43711vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:61628vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:61627vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:61629vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:60520vendor-advisory
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