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OpenAdvisories
High · 7.2 CVE-2025-61927 EUVD-2025-33777GHSA-37j7-fg3j-429f

Happy-DOM has VM Context Escape

Published Oct 10, 2025 · Updated Oct 10, 2025 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
capricorn86 happy-dom < 20.0.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm happy-dom < 20.0.0 20.0.0 GHSA-37j7-fg3j-429f

References