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CVE-2026-23533

FreeRDP has heap-buffer-overflow in clear_decompress_residual_data PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
FreeRDP / FreeRDPaffected < 3.21.0

CWE

CWE-122

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A malicious server can exploit a client-side heap buffer overflow vulnerability in the RDPGFX ClearCodec decode path. This occurs when maliciously crafted residual data causes out-of-bounds writes during color output. Successful exploitation can lead to a crash, resulting in a Denial of Service (DoS), and potentially heap corruption with a risk of arbitrary code execution.