CVE-2026-118659: high-severity vulnerability in capricorn86 happy-dom
@happy-dom/server-renderer: ServerRendererServer Target-Origin Bypass SSRF / Open Proxy
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 21.0.2, the Happy DOM server-renderer package's ServerRendererServer accepts unauthenticated HTTP/2 requests and resolves attacker-controlled :path values against server.targetOrigin in #onIncomingRequest in packages/@happy-dom/server-renderer/src/ServerRendererServer.ts without confirming that the resolved origin remains trusted before calling fetch. A protocol-relative path can change the destination to an arbitrary HTTP or HTTPS endpoint reachable by the server, including local and internal services, and the proxy relays the fetched response headers and body to the requester. This issue is fixed in version 21.0.2.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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-2025-61927HIGHHappy-DOM has VM Context EscapeEPSS 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%