CVE-2026-26986CWE-416

FreeRDP has heap-use-after-free in rail_window_free

Medium · published February 25, 2026

CVSS v4.0
5.5
EPSS
1%
Percentile
45.8
In the wild
Unconfirmed
What it is

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `rail_window_free` dereferences a freed `xfAppWindow` pointer during `HashTable_Free` cleanup because `xf_rail_window_common` calls `free(appWindow)` on title allocation failure without first removing the entry from the `railWindows` hash table, leaving a dangling pointer that is freed again on disconnect. Version 3.23.0 fixes the vulnerability.

The record
Technical detail
CVSS v4.0
5.5 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00557 · 45.8th percentile
Weakness
CWE-416 · Use After Free
Published
2026-02-25T21:01Z
EPSS history
Timeline
  • 25 FEB 21:01Z
    FreeRDP has heap-use-after-free in rail_window_free
    cvelistv5