CVE-2025-61927: high-severity vulnerability in capricorn86 happy-dom
Happy-DOM has VM Context Escape
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.2epss 0.6%
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.
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
Affected products
capricorn86 · happy-domRelated CVEs — capricorn86 happy-dom
In the same product, most dangerous first.
CVE-2024-51757CRITICALFixes security vulnerability that allowed for server side code to be executed by a <script> tagEPSS 0.8%CVE-2026-33943HIGHHappy DOM ECMAScriptModuleCompiler: unsanitized export names are interpolated as executable codeEPSS 0.6%CVE-2026-115895HIGHHappy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code executionEPSS 0.5%CVE-2026-34226HIGHHappy DOM's fetch credentials include uses page-origin cookies instead of target-origin cookiesEPSS 0.5%CVE-2026-118660HIGHHappy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTMLEPSS 0.4%CVE-2026-118659HIGH@happy-dom/server-renderer: ServerRendererServer Target-Origin Bypass SSRF / Open ProxyEPSS 0.4%