lsegal yard up to 0.9.43 yard-cache-secret.html path traversal

Summaryinfo

A vulnerability classified as critical was found in lsegal yard up to 0.9.43. This affects an unknown part of the file yard-cache-secret.html. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-49342. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in lsegal yard up to 0.9.43. This vulnerability affects an unknown function of the file yard-cache-secret.html. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-49342 since 05/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

By approaching the search of inurl:yard-cache-secret.html it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 0.9.44 eliminates this vulnerability. Applying the patch f78c19f0dd33a407085b4ed181bb60c0aa0078b4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38069). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• lsegal

Name

• yard

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11
• 0.9.12
• 0.9.13
• 0.9.14
• 0.9.15
• 0.9.16
• 0.9.17
• 0.9.18
• 0.9.19
• 0.9.20
• 0.9.21
• 0.9.22
• 0.9.23
• 0.9.24
• 0.9.25
• 0.9.26
• 0.9.27
• 0.9.28
• 0.9.29
• 0.9.30
• 0.9.31
• 0.9.32
• 0.9.33
• 0.9.34
• 0.9.35
• 0.9.36
• 0.9.37
• 0.9.38
• 0.9.39
• 0.9.40
• 0.9.41
• 0.9.42
• 0.9.43

License

• open-source

Website

• Product: https://github.com/lsegal/yard/

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Once again VulDB remains the best source for vulnerability data.

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