CVE detail
CVE-2026-33937
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 22.0 · diversity 13.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
8 source links · newest first
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33937.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMar 27, 2026, 9:17 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2452523bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMar 27, 2026, 9:17 PM - https://access.redhat.com/security/cve/CVE-2026-33937access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 27, 2026, 9:17 PM - https://access.redhat.com/errata/RHSA-2026:34342access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 27, 2026, 9:17 PM - https://access.redhat.com/errata/RHSA-2026:10175access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 27, 2026, 9:17 PM No excerpt available.
Exploitgithub.comMar 27, 2026, 9:17 PMNo excerpt available.
Exploitgithub.comMar 27, 2026, 9:17 PM- https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2github.com
No excerpt available.
Exploitgithub.comMar 27, 2026, 9:17 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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