CVE-2026-25997: Freerdp

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_clipboard_format_equal` reads freed `lastSentFormats` memory because `xf_clipboard_formats_free` (called from the cliprdr channel thread during auto-reconnect) frees the array while the X11 event thread concurrently iterates it in `xf_clipboard_changed`, triggering a heap use after free. Version 3.23.0 fixes the issue.

Affected products

• Freerdp Freerdp: before 3.23.0 (fixed in 3.23.0)

Published 2026-02-25. Last modified 2026-06-17.