CVE-2026-33995 FreeRDP: Possible double free in kerberos_AcceptSecurityContext

Medium 5.3 Published 30 Mar 2026 Updated 2 Apr 2026

A double-free vulnerability in FreeRDP's Kerberos implementation can cause client crashes during failed authentication teardowns on systems with Kerberos configured.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-33995?

CVE-2026-33995 is a medium-severity use after free vulnerability in Freerdp Freerdp, published on 30 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a double-free vulnerability in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c) can cause a crash in any FreeRDP clients on systems where Kerberos and/or Kerberos U2U is configured (Samba AD member, or krb5 for NFS). The crash is triggered during NLA connection teardown and requires a failed authentication attempt. This issue has been patched in version 3.24.2.

Weakness: CWE-415

Which versions are affected by CVE-2026-33995?

It affects 1 product.

Products include Freerdp Freerdp.

How do I fix CVE-2026-33995?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-33995 being exploited?

There is no known exploitation of CVE-2026-33995 in the wild and no public exploit code.

All Freerdp Freerdp vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-33995, GHSA-mv25-f4p2-5mxx, UBUNTU-CVE-2026-33995.