CVE-2026-122306

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    CVE-2026-122306

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Kyverno before 1.19.2 Denial of Service via Exponential-Time Wildcard Matching

    Details: Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespaced policy authors to exhaust admission controller CPU by submitting pathological wildcard patterns. Attackers can create a Policy with crafted match and exclude names evaluated by ValidateMatchExcludeConflict, pinning cores and causing cluster-wide webhook timeouts that block resource operations.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/122xxx/CVE-2026-122306.json, https://github.com/kyverno/kyverno/security/advisories/GHSA-8mrj-27wr-599g, https://nvd.nist.gov/vuln/detail/CVE-2026-122306, https://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-exponential-time-wildcard-matching

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -e63308f1e16c05cd009ac4864be6ec25c66b49be

    Affected versions

    kyverno-policies-chart-3.9.2-rc.5
    kyverno-policies-chart-3.9.1
    kyverno-policies-chart-3.9.0
    kyverno-policies-chart-3.9.0-rc.4
    kyverno-policies-chart-3.9.0-rc.3
    kyverno-policies-chart-3.9.0-rc.2
    kyverno-policies-chart-3.9.0-rc.1

    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-2026-122306 | CVE-DB