GitHub Advisoryadvisory · Maven
GHSA-r4gv-qr8j-p3pg handlebars.java FileTemplateLoader Path Traversal
HIGH
Official page ↗
- Aliases
- CVE-2026-55760
- Ecosystem
- Maven
- Packages
- com.github.jknack:handlebars
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-22
- Reviewed
- 2026-06-17
Affected packages
• Maven com.github.jknack:handlebars: < 4.5.2 → fixed in 4.5.2
Description
Impact
Any application that passes user-controlled input to Handlebars.compile() using a FileTemplateLoader (or ClassPathTemplateLoader) is vulnerable to arbitrary file read. This is a realistic attack surface for web applications that use template names from URL path parameters, request parameters, or other user-controlled sources.
Patches
com.github.jknack:handlebars:4.5.2
Workarounds
Validate template name is derived from user input.
```java
if (!file.getPath().startsWith(new File(prefix).getCanonicalPath())) {
throw new IOException("Path traversal attempt detected: " + location);
}
```
Related
Alias · CVE (1)
- CVE-2026-55760 Handlebars.java provides logic-less and semantic Mustache templates with Java. vulnerability
Weakness · CWE (1)
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness