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Vulnerabilities CVE-2026-23531

CVE-2026-23531

High
Open
TLP:CLEAR

FreeRDP has heap-buffer-overflow in clear_decompress

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Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, in ClearCodec, when `glyphData` is present, `clear_decompress` calls `freerdp_image_copy_no_overlap` without validating the destination rectangle, allowing an out-of-bounds read/write via crafted RDPGFX surface updates. 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.

Details

CVSS Score
7.7
EPSS Score
0.44%

36.9th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Confidence
90%
Published
Jan 19, 2026
Last Modified
Jul 15, 2026
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