CVE-2025-15566Network attack vector

Authenticated code execution via header configuration injection

Published Feb 6, 2026 · Updated Feb 6, 2026

Configuration injection in Kubernetes ingress-nginx before 1.12.5 or 1.13.1 allows remote authenticated users to execute controller code. The controller copies untrusted header data from the ConfigMap referenced by nginx.ingress.kubernetes.io/auth-proxy-set-headers into generated nginx configuration without blocking directive-breaking content. Creating or modifying an Ingress and its referenced ConfigMap is required; execution runs as the controller and can expose every cluster Secret accessible to it.

CVSS severity8.8
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Configuration injection in Kubernetes ingress-nginx before 1.12.5 or 1.13.1 allows remote authenticated users to execute controller code. The controller copies untrusted header data from the ConfigMap referenced by nginx.ingress.kubernetes.io/auth-proxy-set-headers into generated nginx configuration without blocking directive-breaking content. Creating or modifying an Ingress and its referenced ConfigMap is required; execution runs as the controller and can expose every cluster Secret accessible to it.

The record

CVE
CVE-2025-15566
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Kubernetes
Product
ingress-nginx
Classifications
CWE-20, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.12.5
  2. Affected versionversion=0 <1.13.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kubernetes · ingress-nginxversion=0 <1.12.5; version=0 <1.13.1

Published CVSS scores

8.8KubernetesCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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