{"api_version":"1","generated_at":"2026-07-14T14:04:06+00:00","cve":"CVE-2026-2229","urls":{"html":"https://cve.report/CVE-2026-2229","api":"https://cve.report/api/cve/CVE-2026-2229.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-2229","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-2229"},"summary":{"title":"undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation","description":"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","state":"PUBLISHED","assigner":"openjs","published_at":"2026-03-12 21:16:25","updated_at":"2026-07-02 12:17:01"},"problem_types":["CWE-248","CWE-1284","CWE-248 CWE-248 Uncaught exception","CWE-1284 CWE-1284 Improper validation of specified quantity in input","CWE-248 Uncaught 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7.0.0 < 7.24.0"},{"status":"unaffected","version":"6.24.0: 7.24.0"}]}],"credits":[{"lang":"en","type":"remediation developer","value":"Matteo Collina"},{"lang":"en","type":"remediation reviewer","value":"Ulises Gascón"},{"lang":"en","type":"remediation reviewer","value":"Rafael Gonzaga"},{"lang":"en","type":"remediation reviewer","value":"Ethan Arrowood"},{"lang":"en","type":"reporter","value":"Aisle Research"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"

Impact

The 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.

The vulnerability exists because:

  1. The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15
  2. The createInflateRaw() call is not wrapped in a try-catch block
  3. The resulting exception propagates up through the call stack and crashes the Node.js process

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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"}],"metrics":[{"cvssV3_1":{"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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-248","description":"CWE-248 Uncaught exception","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1284","description":"CWE-1284 Improper validation of specified quantity in input","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-03-12T20:27:05.600Z","orgId":"ce714d77-add3-4f53-aff5-83d477b104bb","shortName":"openjs"},"references":[{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8"},{"url":"https://hackerone.com/reports/3487486"},{"url":"https://cna.openjsf.org/security-advisories.html"},{"url":"https://datatracker.ietf.org/doc/html/rfc7692"},{"url":"https://nodejs.org/api/zlib.html#class-zlibinflateraw"}],"source":{"advisory":"GHSA-v9p9-hfj2-hcw8","discovery":"UNKNOWN"},"title":"undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation","x_generator":{"engine":"Vulnogram 1.0.0"}}},"cveMetadata":{"assignerOrgId":"ce714d77-add3-4f53-aff5-83d477b104bb","assignerShortName":"openjs","cveId":"CVE-2026-2229","datePublished":"2026-03-12T20:27:05.600Z","dateReserved":"2026-02-08T17:51:16.985Z","dateUpdated":"2026-07-02T12:05:21.753Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-03-12 21:16:25","lastModifiedDate":"2026-07-02 12:17:01","problem_types":["CWE-248","CWE-1284","CWE-248 CWE-248 Uncaught exception","CWE-1284 CWE-1284 Improper validation of specified quantity in input","CWE-248 Uncaught Exception"],"metrics":{"cvssMetricV31":[{"source":"ce714d77-add3-4f53-aff5-83d477b104bb","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-03-13T13:06:30.575811Z","id":"CVE-2026-2229","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*","versionEndExcluding":"6.24.0","matchCriteriaId":"C08CE582-019D-4A06-910A-6010C2D6EF4F"},{"vulnerable":true,"criteria":"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*","versionStartIncluding":"7.0.0","versionEndExcluding":"7.24.0","matchCriteriaId":"F016E7D9-C45A-4DEF-9AD8-F0581AF5E509"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"2229","Ordinal":"1","Title":"undici is vulnerable to Unhandled Exception in undici WebSocket ","CVE":"CVE-2026-2229","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"2229","Ordinal":"1","NoteData":"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","Type":"Description","Title":"undici is vulnerable to Unhandled Exception in undici WebSocket "}]}}}