Double Free in Freerdp
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.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2557-79qc-6gfr (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-double-free-in-winpr-kerbero… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121956?
- CVE-2026-121956 is a high-severity vulnerability in Freerdp, classified under Double Free. CVSS score: 7.5/10. Published 2026-11-04.
- How severe is CVE-2026-121956?
- High severity. CVSS v3 base score is 7.5 out of 10.