---
title: "CVE-2026-118659: Happy DOM - Server Side Request Forgery"
description: "Happy DOM server-renderer < 21.0.2 contains a server-side request forgery caused by resolving attacker-controlled :path values without origin validation in ServerRendererServer, letting attackers make arbitrary HTTP/HTTPS requests, exploit requires unauthenticated HTTP/2 access."
url: https://panop.io/threat-heartbeat/CVE-2026-118659/
---

# CVE-2026-118659 Happy DOM - Server Side Request Forgery

Happy DOM server-renderer < 21.0.2 contains a server-side request forgery caused by resolving attacker-controlled :path values without origin validation in ServerRendererServer, letting attackers make arbitrary HTTP/HTTPS requests, exploit requires unauthenticated HTTP/2 access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-118659)

## Details

Type

Server Side Request Forgery

Impact

Server Side Request Forgery, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to version 21.0.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-118659](https://nvd.nist.gov/vuln/detail/CVE-2026-118659)
- [https://github.com/capricorn86/happy-dom/commit/1f3ffdf634231361de1a2acb629b4fe8ee1bd85d](https://github.com/capricorn86/happy-dom/commit/1f3ffdf634231361de1a2acb629b4fe8ee1bd85d)
- [https://github.com/capricorn86/happy-dom/pull/2520](https://github.com/capricorn86/happy-dom/pull/2520)
- [https://github.com/capricorn86/happy-dom/releases/tag/v21.0.2](https://github.com/capricorn86/happy-dom/releases/tag/v21.0.2)
- [https://github.com/capricorn86/happy-dom/security/advisories/GHSA-pmf4-3xr3-xjhg](https://github.com/capricorn86/happy-dom/security/advisories/GHSA-pmf4-3xr3-xjhg)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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