Is this vulnerability remotely exploitable from the internet?

Indirectly. An attacker typically must have the ability to interact with the Kubernetes API to create or modify Ingress resources. In managed or multi-tenant environments where external users can define Ingress objects, this can effectively become remotely exploitable.

What level of access does an attacker need to exploit this issue?

The attacker needs permissions to create or update Ingress objects that are processed by the vulnerable ingress-nginx controller, including the ability to set the `nginx.ingress.kubernetes.io/auth-proxy-set-headers` annotation.

What is the safest general fix pattern?

Restrict and validate user-controlled configuration inputs. Specifically, constrain or disable powerful annotations that inject configuration, validate annotation values against strict schemas, and reduce the privileges of ingress-nginx so that a compromise has limited blast radius.

Severity:

HIGH RISK

(8.8)

Improper Input Validation (CWE-20) in ingress-nginx auth-proxy-set-headers Annotation

CVE-2025-15566

Published:

Feb 5, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Remote Code Execution and Sensitive Data Exposure

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Remote Code Execution and Sensitive Data Exposure

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Improper Input Validation (CWE-20) in ingress-nginx auth-proxy-set-headers Annotation

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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