joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()`
Impact
Any application that validates a user-supplied string with Joi.string().isoDate() can be stalled by a single request. One of the regular expressions the rule runs over the input was unanchored, so a valid ISO date followed by a long run of fractional-second digits made the regex engine restart its search from every position in the string, costing time proportional to the square of the input length. 64 KB of digits costs about 1.4 s and 256 KB about 22 s.
Patches
Upgrade to version 17.13.7 or 18.2.6 depending on your current major version.
Workarounds
None except capping the length of the string before it reaches joi.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | joi | >= 17.2.0, < 17.13.7, >= 18.0.0, < 18.2.6 | 17.13.7, 18.2.6 |
References
- https://github.com/hapijs/joi/security/advisories/GHSA-6h2x-m376-mqjq
- https://nvd.nist.gov/vuln/detail/CVE-2026-92599
- https://github.com/hapijs/joi/pull/3143
- https://github.com/hapijs/joi/pull/3145
- https://github.com/hapijs/joi/commit/115e7b58d5eaaecc5e9b7093d41899ad6fb053ec
- https://github.com/hapijs/joi/commit/e70df424c367f2976db63b089504413744a21245
- https://github.com/hapijs/joi
- https://www.vulncheck.com/advisories/joi-before-17.13.7-and-18.2.6-redos-via-isodate
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1333- Platform
- npm
- Package
joi- Disclosed
- 29.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6h2x-m376-mqjq - CC BY 4.0
Vulnerability history: joi
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 06.2026 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 2
- Low 2
Disclosures per year
- 2026: 5
-
joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()` this entry
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