{"id":"CVE-2026-106445","revision":"f57f450ed6ae42fb9267adb9357e9bb6","records":[{"revision":"f57f450ed6ae42fb9267adb9357e9bb6","observedAt":"2026-10-25T04:17:41.466+00:00","statement":{"source":"nvd","id":"CVE-2026-106445","aliases":[],"title":"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 a…","description":"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.","state":0,"publishedAt":"2026-10-06T20:17:26.293+00:00","modifiedAt":"2026-10-12T15:17:06.91+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9.2,"severity":"CRITICAL"}],"references":["https://github.com/handlebars-lang/handlebars.js/commit/ceec388abe1d1aac8f6369860d5f390fa71ef4fa","https://github.com/handlebars-lang/handlebars.js/pull/2185","https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.10","https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-p8wg-vrv2-v86f"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106445","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-184","CWE-1289"],"productCriteria":[],"sourceDates":{"published":"2026-10-06T20:17:26.293","lastModified":"2026-10-12T15:17:06.910"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-106445","identifiers":["CVE-2026-106445"]},"retained":false,"historicalAffected":[]}],"coverage":[]}