CVE-2026-122305

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    CVE-2026-122305

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Kyverno before 1.19.2 Denial of Service via Nested Variable Substitution Loop

    Details: Kyverno before 1.19.2 contains a denial of service vulnerability in substituteVariablesIfAny that allows low-privileged users to hang the admission webhook via self-referential variable templates. Attackers can create resources whose annotations re-introduce the embedded policy variable, causing unbounded substitution loops that exhaust CPU and memory and block cluster-wide admission.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/122xxx/CVE-2026-122305.json, https://github.com/kyverno/kyverno/security/advisories/GHSA-338x-hgrv-626h, https://nvd.nist.gov/vuln/detail/CVE-2026-122305, https://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-nested-variable-substitution-loop

    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-2026-122305 | CVE-DB