CVE-2026-118659

    Dashboard / Vulnerabilities / CVE-2026-118659

    CVE-2026-118659

    Published: 28 Oct 2026Last Modified: 31 Oct 2026

    Summary: @happy-dom/server-renderer: ServerRendererServer Target-Origin Bypass SSRF / Open Proxy

    Details: 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.

    References: https://github.com/capricorn86/happy-dom/releases/tag/v21.0.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118659.json, https://github.com/capricorn86/happy-dom/security/advisories/GHSA-pmf4-3xr3-xjhg, https://nvd.nist.gov/vuln/detail/CVE-2026-118659, https://github.com/capricorn86/happy-dom/commit/1f3ffdf634231361de1a2acb629b4fe8ee1bd85d, https://github.com/capricorn86/happy-dom/pull/2520

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1f3ffdf634231361de1a2acb629b4fe8ee1bd85d

    Affected versions

    v21.0.1
    v21.0.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118659 | CVE-DB