CVE Feed

    Dashboard / CVE / CVE-2026-122303

    CVE-2026-122303

    Kyverno from 1.17.0 before 1.19.2 contains an authorization bypass vulnerability that allows namespace tenants to overwrite resources in other namespaces via NamespacedMutatingPolicy mutate-existing targetMatchConstraints.expression. Attackers can return a CEL map literal fabricating a target with an attacker-chosen metadata.namespace, causing the privileged background controller to overwrite Secrets, Deployments, or policies cluster-wide.

    Published:Nov 5, 2026
    Last Modified:Nov 5, 2026
    EPS:Nov 5, 2026
    EPSS Score:
    CVSS Score:9.9

    Affected Products

    Vendor
    Kyverno
    Product
    Kyverno

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-122323 (CVSS 8.7) — Kyverno from 1.11.0 before 1.19.2 contains an unbounded decompression vulnerability in FetchSignatureBlob that…
    CVE-2026-122322 (CVSS 8.7) — Kyverno from 1.11.0 before 1.19.2 contains an unbounded decompression vulnerability in extractStatement that a…
    CVE-2026-122321 (CVSS 8.5) — Kyverno 1.18.0 before 1.19.2 contains a signature verification bypass in verifyImages because cached verificat…
    CVE-2026-122320 (CVSS 8.3) — Kyverno before 1.19.2 contains a missing authorization vulnerability that allows namespaced Policy authors to …
    CVE-2026-122319 (CVSS 8.7) — Kyverno before 1.19.2 contains a denial-of-service vulnerability in the In and NotIn operators that allows att…
    CVE-2026-122318 (CVSS 7.2) — Kyverno before 1.19.2 contains an authentication bypass in matchCertificateData that skips verifyImages subjec…
    CVE-2026-122316 (CVSS 8.4) — Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing backgr…
    CVE-2026-122315 (CVSS 8.7) — Kyverno before 1.19.2 contains an unchecked type assertion in buildStatementMap that allows unauthenticated at…
    CVE-2026-122313 (CVSS 9.4) — Kyverno from 1.17.0 before 1.19.2 contains a privilege escalation vulnerability that allows namespace-scoped t…
    CVE-2026-122314 (CVSS 8.7) — Kyverno before 1.19.2 contains an unchecked type assertion in its variable-substitution engine that allows use…

    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