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Vulnerability record · CVE-2025-15566 · published 6 February 2026

CVE-2025-15566: Improper input validation vulnerability

A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/auth-proxy-set-headers` Ingress annotation 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.)

8.8 CVSS 3.1 High EPSS 0.50% · top 59.8% CWE-20 · Improper input validation Deferred
8.8CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/auth-proxy-set-headers` Ingress annotation 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.)

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

References

LinkTags
https://github.com/kubernetes/kubernetes/issues/136789

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Source: NIST National Vulnerability Database (record CVE-2025-15566), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.