CVE-2026-23530

CRITICAL

FreeRDP < 3.21.0 - Heap-based Buffer Overflow in Planar Bitmap Decompression

Title source: llm
STIX 2.1

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0,`freerdp_bitmap_decompress_planar` does not validate `nSrcWidth`/`nSrcHeight` against `planar->maxWidth`/`maxHeight` before RLE decode. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

References (5)

Core 5

Scores

CVSS v3 9.8
EPSS 0.0060
EPSS Percentile 43.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-122
Status published
Products (1)
freerdp/freerdp < 3.21.0
Published Jan 19, 2026
Tracked Since Feb 18, 2026