CVE-2026-23883

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, xf_Pointer_New frees cursorPixels on failure, then pointer_free calls xf_Pointer_Free and frees it again, triggering ASan UAF. 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.

Affected Software

Weaknesses

• CWE-416: CWE-416: Use After Free

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

freerdp: FreeRDP: Arbitrary code execution and denial of service via malicious server

Additional References

• https://access.redhat.com/security/cve/CVE-2026-23883
• https://bugzilla.redhat.com/show_bug.cgi?id=2430885
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23883.json
• https://access.redhat.com/errata/RHSA-2026:2952
• https://access.redhat.com/errata/RHSA-2026:2222
• https://access.redhat.com/errata/RHSA-2026:2081
• https://access.redhat.com/errata/RHSA-2026:2770
• https://access.redhat.com/errata/RHSA-2026:2824
• https://access.redhat.com/errata/RHSA-2026:2736
• https://access.redhat.com/errata/RHSA-2026:3037
• https://access.redhat.com/errata/RHSA-2026:2048

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcrr-85qx-4p6x
• https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L312-L319
• https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L340
• https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/pointer.c#L164-L174
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

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