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DEBIAN-CVE-2026-33941

Type: advisorySource: OSV1 source record

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler (`bin/handlebars` / `lib/precompiler.js`) concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it emits, without any escaping or sanitization. An attacker who can influence template filenames or CLI arguments can inject arbitrary JavaScript that executes when the generated bundle is loaded in Node.js or a browser. Version 4.7.9 fixes the issue. Some workarounds are available. First, validate all CLI inputs before invoking the precompiler. Reject filenames and option values that contain characters with JavaScript string-escaping significance (`"`, `'`, `;`, etc.). Second, use a fixed, trusted namespace string passed via a configuration file rather than command-line arguments in automated pipelines. Third, run the precompiler in a sandboxed environment (container with no write access to sensitive paths) to limit the impact of successful exploitation. Fourth, audit template filenames in any repository or package that is consumed by an automated build pipeline.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-33941

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33941

node-handlebars

Source reference: /affected/0/package/name

Affected versions
3:4.7.7+~4.1.0-1

Source reference: /affected/0/versions

3:4.7.9-1

Source reference: /affected/0/versions

3:4.7.9-2

Source reference: /affected/0/versions

3:4.7.9-3

Source reference: /affected/0/versions

3:4.7.9-4

Source reference: /affected/0/versions

3:4.7.9-5

Source reference: /affected/0/versions

3:4.7.9-6

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-handlebars

Source reference: /affected/1/package/name

Affected versions
3:4.7.7+~4.1.0-1

Source reference: /affected/1/versions

3:4.7.9-1

Source reference: /affected/1/versions

3:4.7.9-2

Source reference: /affected/1/versions

3:4.7.9-3

Source reference: /affected/1/versions

3:4.7.9-4

Source reference: /affected/1/versions

3:4.7.9-5

Source reference: /affected/1/versions

3:4.7.9-6

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

node-handlebars

Source reference: /affected/2/package/name

Affected versions
3:4.7.7+~4.1.0-1

Source reference: /affected/2/versions

Fixed versions
3:4.7.9-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-handlebars",
      "purl": "pkg:deb/debian/node-handlebars?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3:4.7.7+~4.1.0-1",
      "3:4.7.9-1",
      "3:4.7.9-2",
      "3:4.7.9-3",
      "3:4.7.9-4",
      "3:4.7.9-5",
      "3:4.7.9-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33941.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-handlebars",
      "purl": "pkg:deb/debian/node-handlebars?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3:4.7.7+~4.1.0-1",
      "3:4.7.9-1",
      "3:4.7.9-2",
      "3:4.7.9-3",
      "3:4.7.9-4",
      "3:4.7.9-5",
      "3:4.7.9-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33941.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3:4.7.9-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-handlebars",
      "purl": "pkg:deb/debian/node-handlebars?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3:4.7.7+~4.1.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33941.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56797 · Revision 1
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Publisher date
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