Privilege Escalation Vulnerability in Kyverno by Nirmata
CVE-2026-122310

9.4CRITICAL

Key Information:

Vendor

Kyverno

Status
Kyverno
Vendor
CVE Published:
5 November 2026

What is CVE-2026-122310?

Kyverno versions 1.19.1 and prior allow a namespace-scoped user to create a Policy that exploits the apiCall urlPath validation flaw. By obscuring path segments with special characters like '#' or '?', users can circumvent restrictions and access cluster-scoped endpoints. This manipulation leverages the Kyverno ServiceAccount, potentially granting unauthorized cluster admin privileges.

Affected Version(s)

kyverno 1.19.1 < 1.19.2

kyverno 1.19.2

References

https://github.com/kyverno/kyverno/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/kyverno-1.19.1-befor...
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

cherez0ff
.