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.

INFO

Published Date :

2026-01-19T17:01:01.380Z

Last Modified :

2026-01-20T21:37:13.986Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-23531 vulnerability.

Vendors Products
Freerdp
  • Freerdp
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23531.

URL Resource
https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L1139-L1145 cve-icon cve-icon cve-icon
https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0 cve-icon cve-icon cve-icon
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-23531 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-23531 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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SS Confidentiality
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact