UBUNTU-CVE-2026-106445

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Source
https://ubuntu.com/security/CVE-2026-106445
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106445.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-106445
Upstream
Published
2026-10-06T20:17:00Z
Modified
2026-10-17T12:58:00Z
Severity
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Handlebars provides the power necessary to let users build semantic templates. From 3.0.0 until 4.7.10, Handlebars lookupProperty returns Function.prototype.constructor before applying the prototype-access deny list because constructor is an own property of Function.prototype. When an attacker can render a controlled template with allowProtoMethodsByDefault enabled and an accessible function in the template context, the template can traverse from that function through its prototype to Function.prototype and then obtain the Function constructor through the own-property bypass. This permits attacker-controlled JavaScript to execute with the server application's privileges. This issue is fixed in version 4.7.10.

References

Affected packages

Ubuntu:18.04:LTS
node-handlebars

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-106445.json"
Ubuntu:20.04:LTS
node-handlebars

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-106445.json"
Ubuntu:22.04:LTS
node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-106445.json"
Ubuntu:24.04:LTS
node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-106445.json"
Ubuntu:26.04:LTS
node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-106445.json"
Ubuntu:26.10
node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/ubuntu/node-handlebars?arch=source&distro=stonking

Affected ranges

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

Affected versions

3:4.*
3:4.7.7+~4.1.0-1
3:4.7.9-5

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "handlebars",
            "binary_version":  "3:4.7.9-5"
        },
        {
            "binary_name":  "libjs-handlebars",
            "binary_version":  "3:4.7.9-5"
        },
        {
            "binary_name":  "libjs-handlebars.runtime",
            "binary_version":  "3:4.7.9-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106445.json"