BIT-hubble-relay-2026-56743

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    BIT-hubble-relay-2026-56743

    Published: 19 Jul 2026Last Modified: 10 Sept 2026

    Summary: Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match

    Details: Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.

    References: https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8, https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171, https://github.com/cilium/cilium/pull/46305, https://github.com/cilium/cilium/pull/46456, https://github.com/cilium/cilium/releases/tag/v1.19.5, https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r, https://nvd.nist.gov/vuln/detail/CVE-2026-56743

    Affected packages

    Package

    Name: hubble-relay

    Purl: pkg:bitnami/hubble-relay

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 1.19.0
    Fixed -1.19.5

    Affected versions

    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
    BIT-hubble-relay-2026-56743 | CVE-DB