CVE-2026-25954 - Vulnerability Analysis

Overview

FreeRDP < 3.23.0 contains a use-after-free vulnerability caused by dereferencing a freed xfAppWindow pointer due to concurrent access in railWindows hash table, letting attackers cause memory corruption or crash, exploit requires concurrent RAIL channel usage.

Severity & Score

Impact

Attackers can cause memory corruption or application crash, potentially leading to denial of service or code execution.

Mitigation

Upgrade to version 3.23.0 or later.

References

• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1350-L1359
• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L647
• https://github.com/FreeRDP/FreeRDP/commit/1994e9844212a6dfe0ff12309fef520e888986b5
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cc88-4j37-mw6j
• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1076
• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1133
• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1230-L1238
• https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1347

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Mar 1, 2026

🟠 CVE-2026-25954 - High (7.5) FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_rail_server_local_move_size` dereferences a freed `xfAppWindow` pointer because `xf_rail_get_window` returns an unprotected pointer from the `railWindows... 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-25954/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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