Kubernetes ingress-nginx Compromise of auth via subset/superset namespace names
Priority LOW 28CWE-73Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
The Kubernetes ingress-nginx component prior to version 0.28.0 allows a user with the ability to create namespaces and to read and create ingress objects to overwrite the password file of another ingress which uses nginx.ingress.kubernetes.io/auth-type: basic and which has a hyphenated namespace or secret name.
Why it matters now
EPSS 0.00894 59th percentileScored 2026-11-07
Fix Fixed ingress-nginx (Kubernetes): 0.28.0k8s.io/ingress-nginx (Go): 0.28.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Kubernetes | ingress-nginx | before 0.28.0 | 0.28.0 | Patch available | CNA |
| — | k8s.io/ingress-nginx (Go) | before 0.28.0 | 0.28.0 | Patch available | GHSA-hhpm-74pm-hf35 |
- ingress-nginx VendorKubernetes Affected before 0.28.0 Fixed in 0.28.0 Patch available CNA
- k8s.io/ingress-nginx (Go) Vendor— Affected before 0.28.0 Fixed in 0.28.0 Patch available GHSA-hhpm-74pm-hf35
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:* | before 0.28.0 | Vulnerable | Kubernetes |
- cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:* Versions before 0.28.0 Vulnerable ·Kubernetes
Remediation
- Fix · CNA ingress-nginx (Kubernetes) Fixed in 0.28.0
- Fix · GHSA-hhpm-74pm-hf35 k8s.io/ingress-nginx (Go) Fixed in 0.28.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-8553
- 2026-10-03 Alias added: GHSA-hhpm-74pm-hf35
References
More Kubernetes Ingress-nginx vulnerabilities
- TI-2026-02839 ingress-nginx rewrite-target nginx configuration injection CVSS 3.1HIGH 8.8
- TI-2023-04644 Improper input validation in Kubernetes ingress-nginx CVSS 3.1HIGH 8.8
- TI-2023-04643 Improper input validation in Kubernetes ingress-nginx CVSS 3.1HIGH 8.8
- TI-2022-04479 Improper input validation in Kubernetes ingress-nginx CVSS 3.1HIGH 8.8
- TI-2021-07835 Ingress-nginx path can be pointed to service account token file CVSS 3.1HIGH 8.1
- TI-2021-07833 Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces CVSS 3.1HIGH 7.6
Sources
- CVE-2020-8553 · CVE Program
- CVE-2020-8553 · NVD
- FIRST EPSS
- GHSA-hhpm-74pm-hf35 · GitHub Advisory Database · CC BY 4.0
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