NULL pointer dereference in FreeRDP - CVE-2026-23948

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Main Vulnerability Database Vulnerabilities #VU122503

NULL pointer dereference in FreeRDP - CVE-2026-23948

Published: February 10, 2026


Vulnerability identifier: #VU122503
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23948
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in rdp_write_logon_info_v2(). A remote attacker can trick the victim into connecting to a malicious server and crash the application.


Affected software

FreeRDP
Red Hat CodeReady Linux Builder for Power, little endian
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
freerdp (Red Hat package)
freerdp2 (Ubuntu package)
libwinpr-devel
freerdp-doc
libwinpr
freerdp-libs
freerdp-devel
freerdp
freerdp-debuginfo
freerdp-debugsource
freerdp-help

How to mitigate CVE-2026-23948

Install updates from vendor's website.

FreeRDP - update to 3.22.0
freerdp (Red Hat package) - addressed in versions 2.0.0-46.rc4.el8_2.10, 2.1.1-5.el7_9.7, 2.2.0-7.el8_6.5, 2.2.0-12.el8_4, 2.2.0-12.el8_8.5, 2.4.1-3.el9_0.4, 2.4.1-6.el9_2.6, 2.11.2-1.el9_4.5, 2.11.7-1.el9_6.7, 2.11.7-1.el9_7.5, 2.11.7-6.el8_10, 3.10.3-3.el10_0.5, 3.10.3-5.el10_1.5
freerdp2 (Ubuntu package) - addressed in versions 2.2.0+dfsg1-0ubuntu0.18.04.4+esm5, 2.6.1+dfsg1-0ubuntu0.20.04.2+esm3, 2.6.1+dfsg1-3ubuntu2.10, 2.11.5+dfsg1-1ubuntu0.1~esm5, 3.5.1+dfsg1-0ubuntu1.2, 3.16.0+dfsg-2ubuntu0.1
libwinpr-devel - update to 2.11.7-6.0.1
freerdp-doc - update to 2.11.7-6.0.1
libwinpr - update to 2.11.7-6.0.1
freerdp-libs - update to 2.11.7-6.0.1
freerdp-devel - update to 2.11.7-6.0.1
freerdp - update to 2.11.7-6.0.1
freerdp - update to 2.11.8-6
freerdp-debuginfo - update to 2.11.8-6
freerdp-debugsource - update to 2.11.8-6
freerdp-devel - update to 2.11.8-6
freerdp-help - update to 2.11.8-6
libwinpr - update to 2.11.8-6
libwinpr-devel - update to 2.11.8-6

External References

Related Security Bulletins