VULNERABILITY INTELLIGENCE

CVE-2026-23531

CVSS score9.8 CRITICAL
EPSS probability0.53%
CISA KEVNot currently listed
Published2026-01-19
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-122
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-122

Primary references