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CVE-2026-33940: Handlebars.js has JavaScript Injection via AST Type Confusion when passing an object as dynamic partial

High · CVSS 8.1 (CVSS 3.1)EPSS n/aPublished Updated Assigner: GitHub_M

Description

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, a crafted object placed in the template context can bypass all conditional guards in `resolvePartial()` and cause `invokePartial()` to return `undefined`. The Handlebars runtime then treats the unresolved partial as a source that needs to be compiled, passing the crafted object to `env.compile()`. Because the object is a valid Handlebars AST containing injected code, the generated JavaScript executes arbitrary commands on the server. The attack requires the adversary to control a value that can be returned by a dynamic partial lookup. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (`require('handlebars/runtime')`). Without `compile()`, the fallback compilation path in `invokePartial` is unreachable. Second, sanitize context data before rendering: Ensure no value in the context is a non-primitive object that could be passed to a dynamic partial. Third, avoid dynamic partial lookups (`{{> (lookup ...)}}`) when context data is user-controlled.

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H · CWE-843, CWE-94

Status incidents that name it

Affected vendors and products

handlebars-lang: handlebars.jsRed Hat: Cluster Observability Operator 1.5.0Red Hat: Cryostat 4Red Hat: Logging Subsystem for Red Hat OpenShiftRed Hat: Red Hat Data Grid 8Red Hat: Red Hat Enterprise Linux 10Red Hat: Red Hat Enterprise Linux 7Red Hat: Red Hat Enterprise Linux 8Red Hat: Red Hat Enterprise Linux 9Red Hat: Red Hat OpenShift AI (RHOAI)Red Hat: Red Hat OpenShift Dev Spaces 3.27Red Hat: Red Hat Process Automation 7

References

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