CVE-2026-118772

joi is a schema description language and data validator for JavaScript

Risk score: 50/100
CVSS: 7.5 v3.1
Published: 29 Oct 2026

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What to know

What it is: 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…
Affected: See advisory
Fix: Upgrade the product to 17.13.9 or 18.3.1 (whichever matches your release line), or later.
Exploitation: No known exploitation

Why it is Yellow

CVSS 7.5 high
Remotely exploitable without logging in

References

Original 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.

Last activity 29 Oct 2026. Patch Forecast updates every hour.