joi is a schema description language and data validator for JavaScript. From 17.1.1 until 17.13.9 and 18.3.1, the Joi.string().email({ multiple: true }) rule uses a separator regular expression whose leading whitespace quantifier is retried at every position in a long whitespace run that contains no separator, causing quadratic work during String.prototype.split. The behavior applies to the default separator and every custom separator. Applications that validate attacker-controlled values with the multiple option and no effective prior length limit can have the Node.js event loop blocked for seconds by one request, preventing other work. A .max() rule is not sufficient when abortEarly: false allows the email rule to run after the maximum-length check fails. This vulnerability is fixed in versions 17.13.9 and 18.3.1.
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Fri, 30 Oct 2026 12:30:00 +0000
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Thu, 29 Oct 2026 18:30:00 +0000
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| Description | joi is a schema description language and data validator for JavaScript. From 17.1.1 until 17.13.9 and 18.3.1, the Joi.string().email({ multiple: true }) rule uses a separator regular expression whose leading whitespace quantifier is retried at every position in a long whitespace run that contains no separator, causing quadratic work during String.prototype.split. The behavior applies to the default separator and every custom separator. Applications that validate attacker-controlled values with the multiple option and no effective prior length limit can have the Node.js event loop blocked for seconds by one request, preventing other work. A .max() rule is not sufficient when abortEarly: false allows the email rule to run after the maximum-length check fails. This vulnerability is fixed in versions 17.13.9 and 18.3.1. | |
| Title | joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service | |
| Weaknesses | CWE-1333 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-10-29T18:13:33.771Z
Reserved: 2026-10-28T19:20:05.018Z
Link: CVE-2026-118772
No data.
Status : Awaiting Analysis
Published: 2026-10-29T19:17:19.563
Modified: 2026-10-30T19:37:07.073
Link: CVE-2026-118772
OpenCVE Enrichment
Updated: 2026-10-29T19:45:11Z
Weaknesses