CVE-2026-106445

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Source
https://cve.org/CVERecord?id=CVE-2026-106445
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106445.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-106445
Aliases
  • GHSA-p8wg-vrv2-v86f
Downstream
Published
2026-10-06T19:39:08Z
Modified
2026-10-08T02:50:33Z
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
Summary
Handlebars: JavaScript Injection via Own Property Check Bypass
Details

Handlebars provides the power necessary to let users build semantic templates. From 4.0.0 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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1289",
        "CWE-184"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106445.json"
}
References

Affected packages

Git / github.com/handlebars-lang/handlebars.js

Affected ranges

Type
GIT
Repo
https://github.com/handlebars-lang/handlebars.js
Events
Introduced
bff5fab8f9d42e21950be00dcf1cedf4dc1a565b
Fixed
ceec388abe1d1aac8f6369860d5f390fa71ef4fa
Fixed
45ce15255e0f430ac6d19742b18e316b7539264e
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "4.0.0"
        },
        {
            "fixed": "4.7.10"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v4.*
v4.0.0
v4.0.1
v4.0.10
v4.0.11
v4.0.12
v4.0.2
v4.0.3
v4.0.4
v4.0.5
v4.0.6
v4.0.7
v4.0.8
v4.0.9
v4.1.1
v4.1.2
v4.1.2-0
v4.2.0
v4.2.1
v4.3.0
v4.3.1
v4.3.2
v4.3.3
v4.3.4
v4.4.0
v4.4.1
v4.4.2
v4.4.3
v4.5.0
v4.5.1
v4.5.2
v4.5.3
v4.6.0
v4.7.0
v4.7.1
v4.7.2
v4.7.3
v4.7.4
v4.7.5
v4.7.6
v4.7.7
v4.7.8
v4.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106445.json"