Double free in FreeRDP - CVE-2026-33995
Published: April 8, 2026
Vulnerability identifier: #VU125371
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-33995
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to double free in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() in the Kerberos SSPI context cleanup path when handling NLA connection teardown after a failed authentication attempt. A remote attacker can trigger an authentication failure to cause a denial of service.
Only clients compiled with Kerberos support and running on systems where a Kerberos realm is configured are vulnerable.
Affected software
FreeRDP
Fedora
freerdp
Fedora
freerdp
How to mitigate CVE-2026-33995
Install security update from vendor's website.
FreeRDP - update to 3.24.2
freerdp - addressed in versions 3.24.2-1.fc42, 3.24.2-1.fc43, 3.24.2-1.fc44
freerdp - addressed in versions 3.24.2-1.fc42, 3.24.2-1.fc43, 3.24.2-1.fc44