CVE-2026-118772 (GCVE-0-2026-118772)

Vulnerability from cvelistv5 – Published: 2026-10-29 18:13 – Updated: 2026-10-29 18:13
VLAI
Title
joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8116 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
hapijs joi Affected: >= 16.0.0, <= 17.1.1
Affected: >= 18.0.0, < 18.3.1
guessed Create a notification for this product.
@hapi joi Affected: >= 16.0.0, <= 17.1.1
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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      "title": "joi: joi: Denial of Service via inefficient regular expression in email validation",
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}



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