CVE-2026-121963

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    CVE-2026-121963

    Published: 4 Nov 2026Last Modified: 7 Nov 2026

    Summary: FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close

    Details: FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121963.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c, https://nvd.nist.gov/vuln/detail/CVE-2026-121963, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close

    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-2026-121963 | CVE-DB