CVE-2026-121956

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    CVE-2026-121956

    Published: 4 Nov 2026Last Modified: 7 Nov 2026

    Summary: FreeRDP before 3.32.2 Double Free in WinPR Kerberos retrieveSomeTgt

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121956.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2557-79qc-6gfr, https://nvd.nist.gov/vuln/detail/CVE-2026-121956, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-double-free-in-winpr-kerberos-retrievesometgt

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -97eff6ddfbbfaa8e42a126d362686bd001ff8bdc

    Affected versions

    3.5.1
    3.5.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121956 | CVE-DB