---
id: CVE-2026-122316
title: >-
  Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via
  NamespacedMutatingPolicy mutateExisting
summary: >-
  Kyverno from 1.17.0 before 1.19.2 contains a missing authorization
  vulnerability in the mutate-existing background processor that allows
  namespaced tenants to modify resources outside their namespace. Attackers can
  create a NamespacedMut…
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-862
vendor: kyverno
product: kyverno
affected:
  - kyverno >= 1.17.0 < 1.19.2
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T02:25:17.167Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122316'
references:
  - url: 'https://github.com/kyverno/kyverno/security/advisories/GHSA-vm98-8c25-h274'
    label: GitHub Security Advisory (GHSA-vm98-8c25-h274)
  - url: >-
      https://www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-write-via-namespacedmutatingpolicy-mutateexisting
    label: >-
      VulnCheck Advisory: Kyverno 1.17.0 before 1.19.2 Cross-Namespace Write via
      NamespacedMutatingPolicy mutateExisting
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.689Z'
---

## Overview

Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing background processor that allows namespaced tenants to modify resources outside their namespace. Attackers can create a NamespacedMutatingPolicy targeting Namespace objects or victim-namespace resources via CEL expressions, making the background-controller ServiceAccount strip Pod Security labels cluster-wide.

## Affected

- `kyverno >= 1.17.0 < 1.19.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.