UBUNTU-CVE-2026-33937

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Source
https://ubuntu.com/security/CVE-2026-33937
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33937
Upstream
Published
2026-03-27T21:17:00Z
Modified
2026-04-02T17:31:27Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile() accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript without quoting or sanitization. An attacker who can supply a crafted AST to compile() can therefore inject and execute arbitrary JavaScript, leading to Remote Code Execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. Validate input type before calling Handlebars.compile(); ensure the argument is always a string, never a plain object or JSON-deserialized value. Use the Handlebars runtime-only build (handlebars/runtime) on the server if templates are pre-compiled at build time; compile() will be unavailable.

References

Affected packages

Ubuntu:18.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.0.10-5?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.0.10-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.0.10-5",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json"

Ubuntu:20.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.2-1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.1.0-1
3:4.5.3-1
3:4.7.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.2-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json"

Ubuntu:22.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.6+~4.1.0-2
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json"

Ubuntu:24.04:LTS / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json"

Ubuntu:25.10 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars@3:4.7.7+~4.1.0-1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars"
        },
        {
            "binary_version": "3:4.7.7+~4.1.0-1",
            "binary_name": "libjs-handlebars.runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33937.json"