CVE-2026-121959

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    CVE-2026-121959

    Published: 4 Nov 2026Last Modified: 7 Nov 2026

    Summary: FreeRDP before 3.32.2 Infinite Loop via Truncated WebSocket Frame

    Details: FreeRDP before 3.32.2 contains an infinite loop vulnerability in websocket_context_read that fails to handle a zero BIO result with payload outstanding. A malicious RD Gateway can send a truncated WebSocket frame followed by a TLS close_notify, causing a client thread to spin and consume CPU until killed.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121959.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x26g-fp9v-c2pg, https://nvd.nist.gov/vuln/detail/CVE-2026-121959, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-infinite-loop-via-truncated-websocket-frame

    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-2026-121959 | CVE-DB