CVE-2026-33986 HIGH

CVE-2026-33986: FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write

Vendor Freerdp
Product FreeRDP
Weakness CWE-122
Published March 30, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 30, 2026 CVE published
June 30, 2026 Record updated