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  4. CVE 2026 118661 happy dom cookie scope forgery no dns label
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-118661GHSA-5FPQ-26GF-QWCR

Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookiesCVE-2026-118661

Answer in brief

CVE-2026-118661 records a Medium severity (CVSS 6.5) vulnerability in Happy DOM: Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies. The current sources do not mark it as known exploited. The current feed maps capricorn86/happy-dom (generic), happy-dom (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-565
Source
CVE List V5
Source checked
Oct 28, 2026
References
5 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps capricorn86/happy-dom (generic), happy-dom (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
capricorn86/happy-domgeneric<20.14.620.14.6
happy-domnpm<=20.14.520.14.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for capricorn86/happy-dom, happy-dom.
  2. 2Review the reported fix. Update capricorn86/happy-dom to 20.14.6; happy-dom to 20.14.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. Prior to 20.14.6, Happy DOM's CookieContainer in src/cookie/CookieContainer.ts does not correctly validate or match Domain cookie attributes. It can accept a Domain unrelated to the origin setting the cookie, including a public suffix, and separately treats an unrelated suffix-sharing hostname as a match because cookieMatchesURL does not enforce a DNS-label boundary. In server-side rendering and prerendering applications that contact attacker-controlled origins and then make requests to a victim origin, these behaviors can plant and deliver a forged cookie, enabling cookie injection or session fixation. This issue is fixed in version 20.14.6.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • @happy-dom/server-renderer: ServerRendererServer Target-Origin Bypass SSRF / Open ProxySame capricorn86/happy-dom package
  • Happy DOM: SSRF via iframe and link stylesheet when parsing untrusted HTMLSame capricorn86/happy-dom package
  • @hono/node-server: `serveStatic` decodes the request path a second time, leading to bypass of middleware on static pathsSame npm ecosystem
  • GraphQL Tools: Per-request connection parameters persist into later users' WebSocket authenticationsSame npm ecosystem
  • GraphQL Tools: Shared legacy executor routes one subscription's results to a different callerSame npm ecosystem