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CVE-2026-23533

Published: Jan 19, 2026

Modified: Jan 20, 2026

PUBLISHED

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. 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.

Vendor	Product	Versions
FreeRDP	FreeRDP	affected `< 3.21.0`

Weaknesses (CWE)

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v

x_refsource_CONFIRM

https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L268-L281

x_refsource_MISC

https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L336

x_refsource_MISC

https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

x_refsource_MISC

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