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Vulnerabilities

Vulnerability · CVE-2026-4342

A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx.

Published Mar 19, 2026 · catalog updated Jun 17, 2026 · Kubernetes Kubernetes

Check if you run it

No confirmed exploitation is on record for CVE-2026-4342. EPSS is 0.63%. Act only if a listed version of Kubernetes Kubernetes is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.63%
Remediation
Advisory link
Affected products
cpe kubernetes/nginx ingress controller

A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe kubernetes/nginx ingress controller1.15.0

How to fix CVE-2026-4342

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4342. EPSS is 0.63%. Act only if a listed version of Kubernetes Kubernetes is installed.

Which versions are affected?

Compare what you have installed with kubernetes/nginx ingress controller 1.15.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 0.63%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Kubernetes securityNginx security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 19, 2026 · Kubernetes Security

    Detected

    ingress-nginx comment-based nginx configuration injection

  2. Jun 17, 2026 · NIST NVD

    Updated

    A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

Sources

  • CVE.orgVulnerability recordCVE-2026-4342

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4342

    30-day exploitation probability 0.6%

    first.org
  • Kubernetes SecurityVendor advisoryCVE-2026-4342

    ingress-nginx comment-based nginx configuration injection

    github.com
  • NIST NVDVulnerability recordCVE-2026-4342

    A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the contro

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.