What’s Vulnerable › Vulnerabilities

CVE-2026-49342: YARD static cache reads raw traversal paths before router sanitization

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-22

Description

YARD is a documentation generation tool for the Ruby programming language. Prior to version 0.9.44, YARD's static cache lookup reads a request path before the router's path cleanup runs. When a server is configured with a document root, a traversal path such as `/../yard-cache-secret.html` is joined against that root and can return a readable sibling `.html` file outside the intended static tree. Version 0.9.44 patches the issue.

Affected products

• lsegal yard: before 0.9.44

References

• https://github.com/lsegal/yard/commit/f78c19f0dd33a407085b4ed181bb60c0aa0078b4
• https://github.com/lsegal/yard/security/advisories/GHSA-pxcc-8665-phx8
• https://github.com/lsegal/yard/security/advisories/GHSA-pxcc-8665-phx8

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