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TI-2023-22907 Aliases CVE-2023-42816

Denial of service from malicious signature in kyverno

Priority LOW 28CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

Kyverno is a policy engine designed for Kubernetes. A security vulnerability was found in Kyverno where an attacker could cause denial of service of Kyverno. The vulnerability was in Kyvernos Notary verifier. An attacker would need control over the registry from which Kyverno would fetch signatures. With such a position, the attacker could return a malicious response to Kyverno, when Kyverno would send a request to the registry. The malicious response would cause denial of service of Kyverno, such that other users' admission requests would be blocked from being processed. This is a vulnerability in a new component released in v1.11.0. The only users affected by this are those that have been building Kyverno from source at the main branch which is not encouraged. Users consuming official Kyverno releases are not affected. There are no known cases of this vulnerability being exploited in the wild.

Why it matters now

EPSS 0.00457 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
kyvernokyverno>= 80d139bb5d1d9d7e907abe851b97dc73821a5be2, < fec2992e3f9fcd6b9c62267522c09b182e7df73b—No fix listedCNA
  • kyverno Vendorkyverno Affected >= 80d139bb5d1d9d7e907abe851b97dc73821a5be2, < fec2992e3f9fcd6b9c62267522c09b182e7df73b Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nirmata:kyverno:1.11.0:-:*:*:*:go:*:*1.11.0VulnerableNirmata
  • cpe:2.3:a:nirmata:kyverno:1.11.0:-:*:*:*:go:*:* Versions 1.11.0 Vulnerable ·Nirmata

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-42816

References

Patch 3

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