CVE-2026-23884 | THREATINT

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, offscreen bitmap deletion leaves `gdi->drawing` pointing to freed memory, causing UAF when related update packets arrive. A malicious server can trigger a client‑side use after free, 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.

PUBLISHED Reserved 2026-01-16 | Published 2026-01-19 | Updated 2026-01-20 | Assigner GitHub_M

HIGH: 7.7CVSS: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

Problem types

CWE-416: Use After Free

Product status

< 3.21.0

affected

References

github.com/...reeRDP/security/advisories/GHSA-cfgj-vc84-f3pp

github.com/...da14d642bc8b8727c/libfreerdp/cache/offscreen.c

github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

cve.org (CVE-2026-23884)

nvd.nist.gov (CVE-2026-23884)

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