CVE-2026-106445Critical· 9.2▾ AbyssalPoC availableHandlebars 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 i…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 50.6 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
1 GitHub repo
0.4% → 0.6%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
handlebars >= 4.0.0, <= 4.7.9Patched in:
handlebars 4.7.10Source: https://github.com/advisories/GHSA-p8wg-vrv2-v86f
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-106446Critical· 9.8Handlebars provides the power necessary to let users build semantic templates
CVE-2026-106444Medium· 4.7Handlebars provides the power necessary to let users build semantic templates
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