CVE-2026-1526

{"id": "CVE-2026-1526", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "ce714d77-add3-4f53-aff5-83d477b104bb", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2026-03-12T21:16:23.933", "references": [{"url": "https://cna.openjsf.org/security-advisories.html", "source": "ce714d77-add3-4f53-aff5-83d477b104bb"}, {"url": "https://datatracker.ietf.org/doc/html/rfc7692", "source": "ce714d77-add3-4f53-aff5-83d477b104bb"}, {"url": "https://github.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8q", "source": "ce714d77-add3-4f53-aff5-83d477b104bb"}, {"url": "https://hackerone.com/reports/3481206", "source": "ce714d77-add3-4f53-aff5-83d477b104bb"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "ce714d77-add3-4f53-aff5-83d477b104bb", "description": [{"lang": "en", "value": "CWE-409"}]}], "descriptions": [{"lang": "en", "value": "The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a \"decompression bomb\") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.\n\nThe vulnerability exists in the\u00a0PerMessageDeflate.decompress()\u00a0method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold."}, {"lang": "es", "value": "El cliente WebSocket undici es vulnerable a un ataque de denegaci\u00f3n de servicio a trav\u00e9s de un consumo de memoria ilimitado durante la descompresi\u00f3n permessage-deflate. Cuando una conexi\u00f3n WebSocket negocia la extensi\u00f3n permessage-deflate, el cliente descomprime las tramas comprimidas entrantes sin imponer ning\u00fan l\u00edmite en el tama\u00f1o de los datos descomprimidos. Un servidor WebSocket malicioso puede enviar una peque\u00f1a trama comprimida (una 'bomba de descompresi\u00f3n') que se expande a un tama\u00f1o extremadamente grande en memoria, causando que el proceso de Node.js agote la memoria disponible y colapse o deje de responder.\n\nLa vulnerabilidad existe en el m\u00e9todo PerMessageDeflate.decompress(), que acumula todos los fragmentos descomprimidos en memoria y los concatena en un \u00fanico Buffer sin verificar si el tama\u00f1o total excede un umbral seguro."}], "lastModified": "2026-03-13T20:06:54.667", "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb"}