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 · corrected/updated Jun 17, 2026 · Kubernetes Kubernetes · evidence confidence high
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.)
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-4342 is a high public vulnerability record for Kubernetes Kubernetes. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Kubernetes Kubernetes is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: kubernetes/nginx ingress controller; kubernetes/nginx ingress controller (1.15.0). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 8.8. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-20. Sources contributing to this record: cve_org, kubernetes, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Mar 19, 2026 · Kubernetes Security
Detected
ingress-nginx comment-based nginx configuration injection
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.)
Affected
- cpe kubernetes/nginx ingress controllerversion unspecified
- cpe kubernetes/nginx ingress controller1.15.0
Sources
- CVE.orgVulnerability recordCVE-2026-4342
Official CVE identifier
cve.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