CVE-2026-21636

{"id": "CVE-2026-21636", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21636", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-21T18:38:13.137061Z"}}], "cvssMetricV30": [{"type": "Secondary", "source": "support@hackerone.com", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "support@hackerone.com", "affectedData": [{"vendor": "nodejs", "product": "node", "versions": [{"status": "affected", "version": "25.2.1", "versionType": "semver", "lessThanOrEqual": "25.2.1"}], "defaultStatus": "unaffected"}]}], "published": "2026-01-20T21:16:05.813", "references": [{"url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases", "tags": ["Release Notes", "Vendor Advisory"], "source": "support@hackerone.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-284"}]}], "descriptions": [{"lang": "en", "value": "A flaw in Node.js's permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when `--permission` is enabled. Even without `--allow-net`, attacker-controlled inputs (such as URLs or socketPath options) can connect to arbitrary local sockets via net, tls, or undici/fetch. This breaks the intended security boundary of the permission model and enables access to privileged local services, potentially leading to privilege escalation, data exposure, or local code execution.\n\n* The issue affects users of the Node.js permission model on version v25.\n\nIn the moment of this vulnerability, network permissions (`--allow-net`) are still in the experimental phase."}, {"lang": "es", "value": "Una falla en el modelo de permisos de Node.js permite que las conexiones de Unix Domain Socket (UDS) eludan las restricciones de red cuando '--permission' est\u00e1 habilitado. Incluso sin '--allow-net', las entradas controladas por el atacante (como URLs u opciones de socketPath) pueden conectarse a sockets locales arbitrarios a trav\u00e9s de net, tls o undici/fetch. Esto rompe el l\u00edmite de seguridad previsto del modelo de permisos y permite el acceso a servicios locales privilegiados, lo que podr\u00eda llevar a escalada de privilegios, exposici\u00f3n de datos o ejecuci\u00f3n de c\u00f3digo local.\n\n* El problema afecta a los usuarios del modelo de permisos de Node.js en la versi\u00f3n v25.\n\nEn el momento de esta vulnerabilidad, los permisos de red ('--allow-net') todav\u00eda est\u00e1n en fase experimental."}], "lastModified": "2026-06-17T10:18:51.073", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "970EF154-D905-4FDA-85CB-C3AB08BEFAEC", "versionEndExcluding": "25.3.0", "versionStartIncluding": "25.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "support@hackerone.com"}