CVE-2026-33986
FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 30, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 24, 2026
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97
- https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77
- https://access.redhat.com/security/cve/CVE-2026-33986vdb-entry
- RHBZ#2453221issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33986.json
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