CVE-2021-25748

MEDIUM6.5EPSS 0.11%

Ingress-nginx `path` sanitization can be bypassed with newline character

Published: 5/24/2023Modified: 5/20/2026

Also known as:GHSA-863x-868h-968xCGA-9p99-mhrf-qhm2

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.

Affected packages (1)

Go/k8s.io/ingress-nginxfrom 0, < 1.2.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References (6)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-25748
PATCHhttps://github.com/kubernetes/ingress-nginx
WEBhttps://github.com/kubernetes/ingress-nginx/issues/8686
WEBhttps://github.com/kubernetes/ingress-nginx/pull/8623
WEBhttps://github.com/kubernetes/ingress-nginx/releases/tag/controller-v1.2.1
WEBhttps://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8