CVE-2026-121407

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    CVE-2026-121407

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: FreeRDP before 3.32.2 Shadow Server Denial of Service via remdesk Channel

    Details: FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server's remdesk_server_thread that allows authenticated clients to crash the process via an inverted PDU length check. Attackers can send an 8192-byte remdesk payload declaring an eight-byte PDU length to trigger a fatal Stream_Seek assertion, aborting the server and dropping sessions.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121407.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x8vp-ff7m-294g, https://nvd.nist.gov/vuln/detail/CVE-2026-121407, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-shadow-server-denial-of-service-via-remdesk-channel

    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-2026-121407 | CVE-DB