CVE-2026-25954 - Vulnerability Analysis
HighCVSS: 7.5Last Updated: February 27, 2026
FreeRDP - Use After Free
Published: February 25, 2026Updated: February 27, 2026PoC AvailableRemote Exploitable
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
Severity: High
CVSS Score: 7.5
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#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
- 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
Related Resources
Details
- CVE ID
- CVE-2026-25954
- Severity
- High
- CVSS Score
- 7.5
- Type
- use_after_free
- Status
- confirmed
CWE
- CWE-416
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H