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Affected Component
Analysis
freerdp
Patched
Name
CVE-2026-23531
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.
CWEs
Published Date
Updated Date
Workaround
-
Analysis#
Vulnerability Ratings#
7.7
CVSSv4
9.8
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
freerdp (buildroot:2025.02.x)
#
Title
Author
Resolve
1
[codec,clear] fix missing length checks
akallabeth <akallabeth@posteo.net>
CVE-2026-23531
2
[codec,clear] check clear_decomress glyphData
akallabeth <akallabeth@posteo.net>
CVE-2026-23531
freerdp (buildroot:master)
#
Title
Author
Resolve
1
[codec,clear] fix missing length checks
akallabeth <akallabeth@posteo.net>
CVE-2026-23531
2
[codec,clear] check clear_decomress glyphData
akallabeth <akallabeth@posteo.net>
CVE-2026-23531