FreeRDP <3.23 UAF via xf_clipboard_format_equal & X11 thread
CVE-2026-25997 Published on February 25, 2026
FreeRDP has heap-use-after-free in xf_clipboard_format_equal
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.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-25997 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-25997
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Affected Versions
FreeRDP Version < 3.23.0 is affected by CVE-2026-25997Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.