EUVD-2025-33777Published

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Happy DOM v19 and lower contains a security vulnerability that puts the owner system at the risk of RCE (Remote Code Execution) attacks. A Node.…

Exact source revision recorded 27 Oct 2026 23:49:47 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2025-33777

Published

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Happy DOM v19 and lower contains a security vulnerability that puts the owner system at the risk of RCE (Remote Code Execution) attacks. A Node.js VM Context is not an isolated environment, and if the user runs untrusted JavaScript code within the Happy DOM VM Context, it may escape the VM and get access to process level functionality. It seems like what the attacker can get control over depends on if the process is using ESM or CommonJS. With CommonJS the attacker can get hold of the `require()` function to import modules. Happy DOM has JavaScript evaluation enabled by default. This may not be obvious to the consumer of Happy DOM and can potentially put the user at risk if untrusted code is executed within the environment. Version 20.0.0 patches the issue by changing JavaScript evaluation to be disabled by default.

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: Oct 10, 2025, 7:38:19 PM

dateUpdated: Oct 10, 2025, 7:59:09 PM

1 related source bulletins · separate from aliases

RHSA-2025:23225: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.25.0 Release.

CVE-2024-4067 · CVE-2025-55247 · CVE-2025-55248 · CVE-2025-55315 · CVE-2025-55752 · CVE-2025-61927 · CVE-2025-66516

Source published: Oct 10, 2025, 7:38:19 PM (timezone not stated)
Source modified: Oct 10, 2025, 7:59:09 PM (timezone not stated)
Observed here: 27 Oct 2026 23:49:47 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 4.0 · 7.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:L/VI:H/VA:H/SC:H/SI:H/SA:H