jknack handlebars.java up to 4.5.1 Template Loader compile path traversal

Summaryinfo

A vulnerability, which was classified as problematic, has been found in jknack handlebars.java up to 4.5.1. The affected element is the function compile of the component Template Loader. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-55760. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in jknack handlebars.java up to 4.5.1. This affects the function compile of the component Template Loader. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality. The summary by CVE is:

Handlebars.java provides logic-less and semantic Mustache templates with Java. Prior to 4.5.2, applications that pass user-controlled input to Handlebars.compile() using FileTemplateLoader or ClassPathTemplateLoader are vulnerable to path traversal, allowing arbitrary file read through template names derived from URL path parameters, request parameters, or other user-controlled sources. This issue is fixed in version 4.5.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-55760 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 4.5.2 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• jknack

Name

• handlebars.java

Version

• 4.5.0
• 4.5.1

Website

• Product: https://github.com/jknack/handlebars.java/

CPE 2.3info

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CPE 2.2info

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