VYPR
Unrated severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026

FreeRDP has heap-buffer-overflow in clear_decompress_residual_data

CVE-2026-23533

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.

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Affected products

20

Patches

Vulnerability mechanics

References

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