CVE-2026-41493: yard: Possible arbitrary path traversal and file access via yard server

April 17, 2026 (updated May 29, 2026)

A path traversal vulnerability was discovered in YARD <= 0.9.41 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.

The original patch in GHSA-xfhh-rx56-rxcr was incorrectly applied.

References

github.com/advisories/GHSA-3jfp-46x4-xgfj
github.com/lsegal/yard/releases/tag/v0.9.42
github.com/lsegal/yard/security/advisories/GHSA-3jfp-46x4-xgfj
github.com/rubysec/ruby-advisory-db/blob/master/gems/yard/CVE-2026-41493.yml
nvd.nist.gov/vuln/detail/CVE-2026-41493

Code Behaviors & Features

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