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CVE-2019-1020001 — Vulnerability in yard — CVE Details

HIGH

Path Traversal vulnerability that affects yard

Published July 2, 2019Updated September 10, 2026Source: osv

Summary

## Possible arbitrary path traversal and file access via `yard server` ### Impact A path traversal vulnerability was discovered in YARD <= 0.9.19 when using `yard server` to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. Thanks to CuongMX from Viettel Cyber Security for discovering this vulnerability. ### Patches Please upgrade to YARD v0.9.20 immediately if you are relying on yard server to host documentation in any untrusted environments. ### Workarounds For users who cannot upgrade, it is possible to perform path sanitization of HTTP requests at your webserver level. WEBrick, for example, can perform such sanitization by default (which you can use via `yard server -s webrick`), as can certain rules in your webserver configuration.

Advisory Timeline

  • First published July 2, 2019 (2659 days ago).
  • Last revised September 10, 2026 — 2627 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update yard to 0.9.20 or later
gem install yard -v 0.9.20

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
yard
rubygems
0.2.0, 0.2.1, 0.2.2, 0.2.3 (+70 more)0.9.20

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Frequently Asked Questions

What is CVE-2019-1020001?
Path Traversal vulnerability that affects yard This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2019-1020001?
CVE-2019-1020001 affects yard. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2019-1020001 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-xfhh-rx56-rxcr

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