AIKIDO-2026-962241
yard is vulnerable to Path Traversal
39
Low Risk
This Affects:
yardTL;DR
YARD's yard server normalizes incoming HTTP request paths in the router and in the base command before mapping them to documentation files. The prior sanitization relies on File.cleanpath plus a leading ../ regex, which does not neutralize alternate path separators, Windows drive-letter prefixes, UNC prefixes, or rooted paths. On a host serving documentation with a configured document root, a crafted request path can escape the intended directory and read files outside it. The fix adds a centralized Server.clean_path helper that converts separators, strips drive letters and leading roots, and collapses traversal segments.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you serve documentation using yard server.
Background info
yard is vulnerable to Path Traversal in versions 0.9.20 - 0.9.44.
How to fix this
Upgrade the yard library to the patch version.
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ISO 27001CompliantISO 42001Compliant
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