CVE-2026-21637

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Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped."}, {"lang": "es", "value": "Una falla en el manejo de errores TLS de Node.js permite a atacantes remotos colapsar o agotar los recursos de un servidor TLS cuando se utilizan 'pskCallback' o 'ALPNCallback'. Las excepciones s\u00edncronas lanzadas durante estas devoluciones de llamada eluden las rutas est\u00e1ndar de manejo de errores TLS (tlsClientError y error), causando una terminaci\u00f3n inmediata del proceso o fugas silenciosas de descriptores de archivo que eventualmente conducen a una denegaci\u00f3n de servicio. Debido a que estas devoluciones de llamada procesan entradas controladas por el atacante durante el handshake TLS, un cliente remoto puede desencadenar el problema repetidamente. Esta vulnerabilidad afecta a los servidores TLS que utilizan devoluciones de llamada PSK o ALPN en todas las versiones de Node.js donde estas devoluciones de llamada lanzan excepciones sin ser envueltas de forma segura."}], "id": "CVE-2026-21637", "lastModified": "2026-06-17T10:18:51.183", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "support@hackerone.com", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21637", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-21T20:22:28.525038Z", "version": "2.0.3"}}]}, "published": "2026-01-20T21:16:05.950", "references": [{"source": "support@hackerone.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "nodejs: Nodejs denial of service", "id": "2431340", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2431340"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-248", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-21637", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nodejs22", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nodejs24", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:20/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:22/nodejs", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nodejs:24/nodejs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-20T20:41:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-21637\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21637\nhttps://nodejs.org/en/blog/vulnerability/december-2025-security-releases"], "threat_severity": "Moderate"}

{"created": "2026-01-21T11:18:54.871031+00:00", "updated": "2026-06-18T06:00:16.589010+00:00", "vendors": ["nodejs", "nodejs$PRODUCT$nodejs"]}