CVE-2026-2229
Estado: ModificadaAlta (7.5)—
ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.
Leer descripción completaMostrar menos
The vulnerability exists because:
Detalles técnicos trazas, registros y código del informe original
* The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15 * The createInflateRaw() call is not wrapped in a try-catch block * The resulting exception propagates up through the call stack and crashes the Node.js process
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.87%
- Percentil entre todas las CVEs puntuadas: 58
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
Cliente WebSocket remoto expuesto a DoS por parámetro malformado en permessage-deflate; validación insuficiente causa crash del proceso Node.js.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-248, CWE-1284
- CWE-248
Referencias
- https://cna.openjsf.org/security-advisories.html
- https://datatracker.ietf.org/doc/html/rfc7692
- https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8
- https://hackerone.com/reports/3487486
- https://nodejs.org/api/zlib.html#class-zlibinflateraw
- https://access.redhat.com/errata/RHSA-2026:13826
- https://access.redhat.com/errata/RHSA-2026:17789
- https://access.redhat.com/errata/RHSA-2026:21772
- https://access.redhat.com/errata/RHSA-2026:21931
- https://access.redhat.com/errata/RHSA-2026:34342
- https://access.redhat.com/errata/RHSA-2026:56431
- https://access.redhat.com/errata/RHSA-2026:5807
- https://access.redhat.com/errata/RHSA-2026:7080
- https://access.redhat.com/errata/RHSA-2026:7123
- https://access.redhat.com/errata/RHSA-2026:7302
- https://access.redhat.com/errata/RHSA-2026:7310
- https://access.redhat.com/errata/RHSA-2026:7350
- https://access.redhat.com/errata/RHSA-2026:7670
- https://access.redhat.com/errata/RHSA-2026:7675
- https://access.redhat.com/errata/RHSA-2026:7983
- https://access.redhat.com/errata/RHSA-2026:9742
- https://access.redhat.com/security/cve/CVE-2026-2229
- https://bugzilla.redhat.com/show_bug.cgi?id=2447143
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2229.json
JSON original (NVD)
Mostrar
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"value": "ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\n\nThe vulnerability exists because:\n\n * The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\n * The createInflateRaw() call is not wrapped in a try-catch block\n * The resulting exception propagates up through the call stack and crashes the Node.js process"
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"value": "Impacto\nEl cliente WebSocket undici es vulnerable a un ataque de denegación de servicio debido a la validación incorrecta del parámetro server_max_window_bits en la extensión permessage-deflate. Cuando un cliente WebSocket se conecta a un servidor, anuncia automáticamente soporte para la compresión permessage-deflate. Un servidor malicioso puede responder con un valor server_max_window_bits fuera de rango (fuera del rango válido de zlib de 8-15). Cuando el servidor envía posteriormente un frame comprimido, el cliente intenta crear una instancia zlib InflateRaw con el valor windowBits no válido, causando una excepción RangeError síncrona que no es capturada, lo que resulta en la terminación inmediata del proceso.\n\nLa vulnerabilidad existe porque:\n\n * La función isValidClientWindowBits() solo valida que el valor contiene dígitos ASCII, no que caiga dentro del rango válido 8-15\n * La llamada a createInflateRaw() no está envuelta en un bloque try-catch\n * La excepción resultante se propaga a través de la pila de llamadas y bloquea el proceso de Node.js"
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