CVE-2026-33986

HIGH

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

Title source: cna

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.

References (2)

[X_Refsource_Confirm] https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97

[X_Refsource_Misc] https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77

View Writeup ZIP pw:eip

Scores

CVSS v3 7.5

EPSS 0.0004

EPSS Percentile 13.6%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-122 CWE-131

Status published

Products (2)

freerdp/freerdp < 3.24.2

FreeRDP/FreeRDP < 3.24.2

Published Mar 30, 2026

Tracked Since Mar 31, 2026