CVE-2023-41378

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    CVE-2023-41378

    Published: 6 Nov 2023Last Modified: 28 Oct 2026

    Summary: Calico Typha hangs during unclean TLS handshake

    Details: In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41378.json, https://nvd.nist.gov/vuln/detail/CVE-2023-41378, https://www.tigera.io/security-bulletins-tta-2023-001/, https://github.com/projectcalico/calico/pull/7908, https://github.com/projectcalico/calico/pull/7993

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0d154c5ee13042898b9d7a7cc34881b336c49e04

    Affected versions

    v3.26.2
    v3.26.1
    v3.26.0

    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-2023-41378 | CVE-DB