UBUNTU-CVE-2026-33940

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Source
https://ubuntu.com/security/CVE-2026-33940
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33940
Upstream
Published
2026-03-27T22:16:00Z
Modified
2026-04-27T18:56:58.571282Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/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, a crafted object placed in the template context can bypass all conditional guards in resolvePartial() and cause invokePartial() to return undefined. The Handlebars runtime then treats the unresolved partial as a source that needs to be compiled, passing the crafted object to env.compile(). Because the object is a valid Handlebars AST containing injected code, the generated JavaScript executes arbitrary commands on the server. The attack requires the adversary to control a value that can be returned by a dynamic partial lookup. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (require('handlebars/runtime')). Without compile(), the fallback compilation path in invokePartial is unreachable. Second, sanitize context data before rendering: Ensure no value in the context is a non-primitive object that could be passed to a dynamic partial. Third, avoid dynamic partial lookups ({{> (lookup ...)}}) when context data is user-controlled.

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_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",
            "binary_version": "3:4.0.10-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.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_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",
            "binary_version": "3:4.7.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.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_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",
            "binary_version": "3:4.7.7+~4.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.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_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",
            "binary_version": "3:4.7.7+~4.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.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_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",
            "binary_version": "3:4.7.7+~4.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.json"
Ubuntu:26.04
node-handlebars

Package

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

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_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",
            "binary_version": "3:4.7.7+~4.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33940.json"