EUVD-2026-16858Published

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled templat…

Exact source revision recorded 30 Oct 2026 05:49:07 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2026-16858

Published

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator (e.g. `{{*n}}`), the compiled template calls `lookupProperty(decorators, "n")`, which returns `undefined`. The runtime then immediately invokes the result as a function, causing an unhandled `TypeError: ... is not a function` that crashes the Node.js process. Any application that compiles user-supplied templates without wrapping the call in a `try/catch` is vulnerable to a single-request Denial of Service. Version 4.7.9 fixes the issue. Some workarounds are available. Wrap compilation and rendering in `try/catch`. Validate template input before passing it to `compile()`; reject templates containing decorator syntax (`{{*...}}`) if decorators are not used in your application. Use the pre-compilation workflow; compile templates at build time and serve only pre-compiled templates; do not call `compile()` at request time.

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 27, 2026, 9:08:24 PM

dateUpdated: Sep 4, 2026, 12:04:44 PM

3 related source bulletins · separate from aliases

RHSA-2026:34342: Red Hat Security Advisory: Cluster Observability Operator 1.5.0

CVE-2020-7753 · CVE-2021-33623 · CVE-2024-4068 · CVE-2024-45338 · CVE-2024-52011 · CVE-2025-22868 · CVE-2025-22870 · CVE-2025-22872 · CVE-2025-47911 · CVE-2025-58190 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-4800 · CVE-2026-4867 · CVE-2026-6321 · CVE-2026-6322 · CVE-2026-6734 · CVE-2026-9277 · CVE-2026-9697 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-25680 · CVE-2026-25681 · CVE-2026-29063 · CVE-2026-32141 · CVE-2026-33228 · CVE-2026-33671 · CVE-2026-33814 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-33937 · CVE-2026-33938 · CVE-2026-33939 · CVE-2026-33940 · CVE-2026-33941 · CVE-2026-39821 · CVE-2026-42506 · CVE-2026-48779

msrc_CVE-2026-33939: Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

CVE-2026-33939

RHSA-2026:10175: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.27.1 Release.

CVE-2025-61728 · CVE-2025-62718 · CVE-2026-2332 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-22731 · CVE-2026-25679 · CVE-2026-26999 · CVE-2026-27137 · CVE-2026-27606 · CVE-2026-29054 · CVE-2026-32305 · CVE-2026-32695 · CVE-2026-33186 · CVE-2026-33433 · CVE-2026-33805 · CVE-2026-33870 · CVE-2026-33871 · CVE-2026-33937 · CVE-2026-33938 · CVE-2026-33939 · CVE-2026-33940 · CVE-2026-33941 · CVE-2026-34986 · CVE-2026-40175

Source published: Mar 27, 2026, 9:08:24 PM (timezone not stated)
Source modified: Sep 4, 2026, 12:04:44 PM (timezone not stated)
Observed here: 30 Oct 2026 05:49:07 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H