CVE-2026-33986 PUBLISHED

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

Assigner: GitHub_M
Reserved: 24.03.2026 Published: 30.03.2026 Updated: 31.03.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	FreeRDP
Product	FreeRDP
Versions	Version < 3.24.2 is affected

References

Problem Types

CWE-122: Heap-based Buffer Overflow CWE
CWE-131: Incorrect Calculation of Buffer Size CWE