CVE-2026-121956

FreeRDP before 3.32.2 contains a double free in the WinPR Kerberos SSPI retrieveSomeTgt function, which installs the krb5 default realm into a target principal that has an empty realm without taking ownership of it. Unauthenticated remote clients can send a crafted NLA/CredSSP u2u TGT request whose server-name component contains '@' to corrupt the heap and crash the server process.

• CWE-415

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2557-79qc-6gfrExploit, Mitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/freerdp-before-3.32.2-double-free-in-winpr-kerberos-retrievesometgtThird Party Advisory
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2557-79qc-6gfrExploit, Mitigation, Vendor Advisory

Published

Nov 4, 2026

Last Modified

Nov 5, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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