CVE-2026-33937

CVE-2026-33937 · Handlebars.js has JavaScript Injection via AST Type Confusion

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Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `Handlebars.compile()` accepts a pre-parsed AST object in addition to a template string. The `value` field of a `NumberLiteral` AST node is emitted directly into the generated JavaScript without quoting or sanitization. An attacker who can supply a crafted AST to `compile()` can therefore inject and execute arbitrary JavaScript, leading to Remote Code Execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. Validate input type before calling `Handlebars.compile()`; ensure the argument is always a `string`, never a plain object or JSON-deserialized value. Use the Handlebars runtime-only build (`handlebars/runtime`) on the server if templates are pre-compiled at build time; `compile()` will be unavailable.

CVSS 9.8 · Критический · EPSS 1,9% · Есть исправление

Опубликовано

2026-03-27T21:03:46.748Z

Обновлено

2026-09-04T12:04:45.273Z

Стек: system · node

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