---
title: "GHSA-6h2x-m376-mqjq: joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()`"
description: "High severity. joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()`. Affects joi; fixed in 18.2.6."
url: https://inlinr.com/advisories/GHSA-6h2x-m376-mqjq
lang: en
---

[Packages](https://inlinr.com/packages) / [joi](https://inlinr.com/packages/joi) / [Security](https://inlinr.com/packages/joi/security)

High Vulnerability GHSA-6h2x-m376-mqjq CVE-2026-92599 Published 29 Sep 2026

# joi: Quadratic regular-expression backtracking in \`Joi.string().isoDate()\`

Your version 

Affected releases · [joi](https://inlinr.com/packages/joi)

- 18.x 18.0.0 – 18.2.5 Fixed in 18.2.6
- 17.x 17.2.0 – 17.13.6 Fixed in 17.13.7

On 18.x, the newest line:

```
npm install joi@18.2.6
```

Every release on a timeline

18.x 

1. Affected

18.0.0 – 18.2.5  
12 releases
2. Fixed

18.2.6 – 18.3.1  
6 releases, latest

17.x 

1. Not affected

17.1.1  
1 release
2. Affected

17.2.0 – 17.13.6  
39 releases
3. Fixed

17.13.7 – 17.13.9  
3 releases

256 stable releases of joi, oldest to newest, one row per major.

## What happens

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.

## How it is exploited

Exploitable over the network, with no account and no action from a user.

- **Confidentiality**: none
- **Integrity**: none
- **Availability**: high

CVSS:3.1/​AV:N/​AC:L/​PR:N/​UI:N/​S:U/​C:N/​I:N/​A:H

## References

- [Reference](https://github.com/hapijs/joi/security/advisories/GHSA-6h2x-m376-mqjq "https://github.com/hapijs/joi/security/advisories/GHSA-6h2x-m376-mqjq")  
github.com/hapijs/joi/security/advisories/GHSA-…
- [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-92599 "https://nvd.nist.gov/vuln/detail/CVE-2026-92599")  
nvd.nist.gov/vuln/detail/CVE-2026-92599
- [Pull request](https://github.com/hapijs/joi/pull/3143 "https://github.com/hapijs/joi/pull/3143")  
#3143
- [Pull request](https://github.com/hapijs/joi/pull/3145 "https://github.com/hapijs/joi/pull/3145")  
#3145
- [Fix commit](https://github.com/hapijs/joi/commit/115e7b58d5eaaecc5e9b7093d41899ad6fb053ec "https://github.com/hapijs/joi/commit/115e7b58d5eaaecc5e9b7093d41899ad6fb053ec")  
115e7b5
- [Fix commit](https://github.com/hapijs/joi/commit/e70df424c367f2976db63b089504413744a21245 "https://github.com/hapijs/joi/commit/e70df424c367f2976db63b089504413744a21245")  
e70df42
- [Package](https://github.com/hapijs/joi "https://github.com/hapijs/joi")  
github.com/hapijs/joi
- [Reference](https://www.vulncheck.com/advisories/joi-before-17.13.7-and-18.2.6-redos-via-isodate "https://www.vulncheck.com/advisories/joi-before-17.13.7-and-18.2.6-redos-via-isodate")  
vulncheck.com/advisories/joi-before-17.13.7-and…