CVE-2026-92599: Joi before 17.13.7 and 18.2.6 ReDoS via isoDate

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-09-22
Weakness: CWE-1333

Description

joi (npm package `joi`, hapi.js) versions >=17.2.0 <17.13.7 and >=18.0.0 <18.2.6 are vulnerable to regular expression denial of service in the `Joi.string().isoDate()` validation rule. One of the regular expressions the rule applies to the input is unanchored, so a valid ISO date followed by a long run of fractional-second digits causes the regex engine to restart its search from every position in the string, yielding time proportional to the square of the input length (about 1.4 s for 64 KB of digits and about 22 s for 256 KB). A remote attacker who can supply a string to an isoDate validation can stall the application with a single request. Fixed in 17.13.7 and 18.2.6; as a workaround, cap the length of the string before it reaches joi.

Affected products

hapijs joi: from 17.2.0 before 17.13.7; from 18.0.0 before 18.2.6 — fixed in 17.13.7, 18.2.6

How to fix

Upgrade to a fixed version: hapijs joi 17.13.7, 18.2.6. Check the vendor advisory for mitigations.

References

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