CVE-2026-25953Public exploitNetwork attack vector

Client crash via unlocked window pointer race

Published Feb 25, 2026 · Updated Feb 25, 2026

Use-after-free in FreeRDP before 3.23.0 allows remote attackers controlling an RDP server to crash the X11 client. The RDPGFX DVC thread keeps a bare xfAppWindow pointer from xf_rail_get_window while the main thread can free it during a fastpath window-delete order. Exploitation requires an X11 client session using RAIL and RDPGFX; crafted concurrent frame and delete messages trigger a client crash.

CVSS severity9.8
Critical
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in FreeRDP before 3.23.0 allows remote attackers controlling an RDP server to crash the X11 client. The RDPGFX DVC thread keeps a bare xfAppWindow pointer from xf_rail_get_window while the main thread can free it during a fastpath window-delete order. Exploitation requires an X11 client session using RAIL and RDPGFX; crafted concurrent frame and delete messages trigger a client crash.

The record

CVE
CVE-2026-25953
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 3.23.0

Published CVSS scores

5.5GitHub, Inc.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
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo