GHSA-R4GV-QR8J-P3PG

Vulnerability from github – Published: 2026-06-17 18:42 – Updated: 2026-06-17 18:42
VLAI
Summary
handlebars.java FileTemplateLoader Path Traversal
Details

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. 

if (!file.getPath().startsWith(new File(prefix).getCanonicalPath())) {
        throw new IOException("Path traversal attempt detected: " + location);
}
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.github.jknack:handlebars"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55760"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-17T18:42:09Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nAny 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.\n\n### Patches\ncom.github.jknack:handlebars:4.5.2\n\n### Workarounds\n\nValidate template name is derived from user input. \n\n```java\nif (!file.getPath().startsWith(new File(prefix).getCanonicalPath())) {\n        throw new IOException(\"Path traversal attempt detected: \" + location);\n}\n```",
  "id": "GHSA-r4gv-qr8j-p3pg",
  "modified": "2026-06-17T18:42:09Z",
  "published": "2026-06-17T18:42:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jknack/handlebars.java/security/advisories/GHSA-r4gv-qr8j-p3pg"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jknack/handlebars.java"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "handlebars.java FileTemplateLoader Path Traversal"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.