CVE-2026-33987 PUBLISHED

FreeRDP: Persistent Cache bmpSize 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 persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
CVSS Score: 7.1

Attack Vector	Local	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
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

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ff8h-p5vc-wcwc
https://github.com/FreeRDP/FreeRDP/commit/1a890eb43492b5eb707cb3dd6fc908f696e8fc1c

Problem Types

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