UBUNTU-CVE-2026-33916

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Source
https://ubuntu.com/security/CVE-2026-33916
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33916.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33916
Upstream
Published
2026-03-27T21:17:00Z
Modified
2026-04-02T21:21:43.326051Z
Severity
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
  • 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N 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, resolvePartial() in the Handlebars runtime resolves partial names via a plain property lookup on options.partials without guarding against prototype-chain traversal. When Object.prototype has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply Object.freeze(Object.prototype) early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (handlebars/runtime), which does not compile templates and reduces the attack surface.

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-2026-33916.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-2026-33916.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-2026-33916.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-2026-33916.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-2026-33916.json"