Description
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.
INFO
Published Date :
2026-03-27T21:03:46.748Z
Last Modified :
2026-04-01T03:55:43.931Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-33937 vulnerability.
| Vendors | Products |
|---|---|
| Handlebarsjs |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33937.
