CVE-2026-118661

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{"affected": [{"affectedData": [{"product": "happy-dom", "vendor": "capricorn86", "versions": [{"status": "affected", "version": "< 20.14.6"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-118661", "lastModified": "2026-11-03T14:17:31.910", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-118661", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-03T13:33:09.550280Z", "version": "2.0.3"}}]}, "published": "2026-10-28T21:16:56.267", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3"}, {"source": "security-advisories@github.com", "url": "https://github.com/capricorn86/happy-dom/pull/2477"}, {"source": "security-advisories@github.com", "url": "https://github.com/capricorn86/happy-dom/releases/tag/v20.14.6"}, {"source": "security-advisories@github.com", "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-565"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "happy-dom: happy-dom: Cookie injection via improper cookie domain validation", "id": "2563189", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563189"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-346", "details": ["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.", "A flaw was found in happy-dom. The cookie management component fails to properly validate and match domain attributes, allowing it to accept cookies for unrelated domains and match hostnames without enforcing domain boundaries. In server-side rendering environments, a remote attacker controlling a malicious origin can plant forged cookies that are subsequently sent to victim domains. This flaw can enable cookie injection and session fixation, potentially compromising user sessions."], "name": "CVE-2026-118661", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform-26/gateway-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform-27/gateway-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Out of support scope", "package_name": "automation-gateway", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "automation-platform-ui", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-feature-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-10-28T20:30:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118661\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118661\nhttps://github.com/capricorn86/happy-dom/commit/f21dbd7d0a0c63cdd41954ba5d0f05def4e0f2b3\nhttps://github.com/capricorn86/happy-dom/pull/2477\nhttps://github.com/capricorn86/happy-dom/releases/tag/v20.14.6\nhttps://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr"], "threat_severity": "Moderate"}

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