Vulnerability in Hapijs Joi
CVE-2026-92599
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/hapijs/joi/security/advisories/GHSA-6h2x-m376-mqjq (vendor-advisory)
- www.vulncheck.com/advisories/joi-before-17.13.7-and-18.2.6-redos-via-isodate (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92599?
- CVE-2026-92599 is a high-severity vulnerability in Hapijs Joi, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-09-16.
- How severe is CVE-2026-92599?
- High severity. CVSS v3 base score is 7.5 out of 10.