CVE-2021-25748

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
Kubernetes	Kubernetes ingress-nginx	>= unspecified, < 1.2.1

References

https://github.com/kubernetes/ingress-nginx/issues/8686Issue Tracking, Mitigation, Vendor Advisory
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8Mailing List, Mitigation, Vendor Advisory
https://github.com/kubernetes/ingress-nginx/issues/8686Issue Tracking, Mitigation, Vendor Advisory
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8Mailing List, Mitigation, Vendor Advisory

Timeline

Published: May 24, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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