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TI-2026-85281 Aliases CVE-2026-122303GHSA-m6w5-f9j8-9pjp

Cross-namespace resource overwrite in Kyverno via NamespacedMutatingPolicy

Priority MEDIUM 40CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Kyverno from 1.17.0 before 1.19.2 contains a missing authorization flaw (CWE-862) in NamespacedMutatingPolicy mutate-existing targetMatchConstraints.expression. A namespace tenant can return a CEL map literal that fabricates a target with an attacker-chosen metadata.namespace, which makes the privileged background controller overwrite resources in other namespaces. An attacker with low privileges and network access can overwrite Secrets, Deployments, or policies cluster-wide.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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.

Why it matters now

EPSS 0.0033 26th percentileScored 2026-11-07
Fix Fixed kyverno (kyverno): 1.19.2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
kyvernokyverno1.17.0 to before 1.19.21.19.2Patch availableCNA
  • kyverno Vendorkyverno Affected 1.17.0 to before 1.19.2 Fixed in 1.19.2 Patch available CNA

Remediation

Upgrade Kyverno to version 1.19.2, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA kyverno (kyverno) Fixed in 1.19.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    kyverno 1.19.2

    21 records Highest priority Priority MEDIUM 6 MEDIUM, 15 LOW

    Other records, highest priority first

    • TI-2026-85289 Kyverno path traversal in namespaced CEL policies reaches cluster objectsPriority MEDIUM 41
    • TI-2026-85282 Authorization bypass in Kyverno lets namespace admins read SecretsPriority MEDIUM 41
    • TI-2026-85291 Privilege escalation in Kyverno lets tenants mutate other namespacesPriority MEDIUM 40
    Show all 21 records →

Timeline

  1. 2026-11-05 Threatist record created from CVE-2026-122303
  2. 2026-11-05 Alias added: GHSA-m6w5-f9j8-9pjp

References

Advisory 1

  • TI-2024-32618 Kyverno's PolicyException objects can be created in any namespace by default CVSS 4.0HIGH 8.7
  • TI-2026-57895 Kyverno before v1.13.0 Policy Bypass via Multiple Exceptions CVSS 4.0CRITICAL 9.4
  • TI-2026-39369 Missing authorization in kyverno CVSS 3.1CRITICAL 9.6
  • TI-2026-17733 Kyverno Cross-Namespace Privilege Escalation via Policy apiCall CVSS 3.1CRITICAL 10.0
  • TI-2026-29924 Kyverno: ServiceAccount token leaked to external servers via apiCall service URL CVSS 3.1CRITICAL 9.1
  • TI-2026-29524 kyverno apicall servicecall implicit bearer token injection leaks kyverno serviceaccount token CVSS 3.1HIGH 8.1
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences