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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-08 · updated 2026-10-26
Weakness: CWE-22

Description

YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD 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. This issue has been patched in version 0.9.42.

Affected products

lsegal yard: before 0.9.42 — fixed in 0.9.42

How to fix

Upgrade to a fixed version: lsegal yard 0.9.42. Check the vendor advisory for mitigations.

References

https://github.com/lsegal/yard/releases/tag/v0.9.42
https://github.com/lsegal/yard/security/advisories/GHSA-3jfp-46x4-xgfj

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