CVE-2026-25954
published 2026-02-25CVE-2026-25954: 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`…
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.49%
39.1th percentile
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` hash table, and the main thread can concurrently delete the window (via a window delete order) while the RAIL channel thread is still using the pointer. Version 3.23.0 fixes the issue.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | freerdp2 | < freerdp3 3.23.0+dfsg-1 (forky) | freerdp3 3.23.0+dfsg-1 (forky) |
| debian | freerdp3 | < freerdp3 3.23.0+dfsg-1 (forky) | freerdp3 3.23.0+dfsg-1 (forky) |
| freerdp | freerdp | < 3.23.0 | 3.23.0 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.05.5MEDIUMCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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Ubuntu
FreeRDP vulnerabilities
vendor_ubuntu·2026-03-18
CVE-2026-25954 FreeRDP vulnerabilities
Title: FreeRDP vulnerabilities
Summary: Several security issues were fixed in FreeRDP.
It was discovered that FreeRDP incorrectly handled certain RDP packets. A
remote attacker could use this issue to cause FreeRDP to crash, resulting
in a denial of service, or possibly execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
vendor_redhat·2026-02-25·CVSS 5.5
CVE-2026-25954 [MEDIUM] CWE-825 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
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` hash table, and the main thread can concurrently delete the window (via a window delete order) while the RAIL channel thread is still using the pointer. Version 3.23.0 fixes the issue.
A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP). A remote attacker could exploit a use-after-free vulnerability in the `xf_rail_server_local_move_size` function. This occurs because the `xf_rail_get_window` function returns an unprotected pointer,
Debian
CVE-2026-25954: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
vendor_debian·2026·CVSS 5.5
CVE-2026-25954 [MEDIUM] CVE-2026-25954: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
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` hash table, and the main thread can concurrently delete the window (via a window delete order) while the RAIL channel thread is still using the pointer. Version 3.23.0 fixes the issue.
Scope: local
bookworm: open
bullseye: open
VulDB
FreeRDP up to 3.22.x xf_rail_server_local_move_size use after free (GHSA-cc88-4j37-mw6j / Nessus ID 300276)
vuldb·2026-05-13·CVSS 5.5
CVE-2026-25954 [MEDIUM] FreeRDP up to 3.22.x xf_rail_server_local_move_size use after free (GHSA-cc88-4j37-mw6j / Nessus ID 300276)
A vulnerability categorized as critical has been discovered in FreeRDP up to 3.22.x. This affects the function xf_rail_server_local_move_size. Such manipulation leads to use after free.
This vulnerability is traded as CVE-2026-25954. The attack may be launched remotely. There is no exploit available.
It is advisable to upgrade the affected component.
OSV
CVE-2026-25954: FreeRDP is a free implementation of the Remote Desktop Protocol
osv·2026-02-25·CVSS 5.5
CVE-2026-25954 [MEDIUM] CVE-2026-25954: FreeRDP is a free implementation of the Remote Desktop Protocol
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` hash table, and the main thread can concurrently delete the window (via a window delete order) while the RAIL channel thread is still using the pointer. Version 3.23.0 fixes the issue.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
bugzilla·2026-02-25·CVSS 7.5
CVE-2026-25954 [HIGH] CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service
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` hash table, and the main thread can concurrently delete the window (via a window delete order) while the RAIL channel thread is still using the pointer. Version 3.23.0 fixes the issue.
Bugzilla
CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
bugzilla·2026-02-25·CVSS 5.5
CVE-2026-25954 [MEDIUM] CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
CVE-2026-25954 freerdp: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This bug is already fixed in a published Bodhi update.
---
FEDORA-2026-53fe996a57 (freerdp-3.23.0-1.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-53fe996a57
Bugzilla
CVE-2026-25954 freerdp2: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
bugzilla·2026-02-25·CVSS 5.5
CVE-2026-25954 [MEDIUM] CVE-2026-25954 freerdp2: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
CVE-2026-25954 freerdp2: FreeRDP: Use-after-free vulnerability leading to denial of service [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained ve
Wiz
CVE-2026-25954 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2026-25954 [MEDIUM] CVE-2026-25954 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-25954 :
NixOS vulnerability analysis and mitigation
xf_rail_server_local_move_size
xfAppWindow
xf_rail_get_window
railWindows
Source : NVD
## 5.5
Score
Published February 25, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
NixOS
Wolfi
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 21.3
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
freerdp-plugins
freerdp-debuginfo
Sources
NVD
Alpine 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, 3.22, 3.23, edge Severity HIGH Has Fix Added at: Mar 02, 2026
Chainguard Has Fix Added at: Mar 02, 2026
Debian 11, 12, 13 Severity HIGH No Fix Added at: Mar 02, 2026
Debian 14 S
https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1076https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1133https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1230-L1238https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1347https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L1350-L1359https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_rail.c#L647https://github.com/FreeRDP/FreeRDP/commit/1994e9844212a6dfe0ff12309fef520e888986b5https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cc88-4j37-mw6jhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cc88-4j37-mw6j
2026-02-25
Published