CVE-2026-92599 · GHSA-6h2x-m376-mqjq

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

Risk score: 64/100
CVSS: 7.5 v3.1
Exploit chance (30 days): 0.6%
Published: 29 Sep 2026

Open in the live forecast Today's forecast

What to know

What it is: 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 po…
Affected: joi (npm) >= 17.2.0, < 17.13.7; joi (npm) >= 18.0.0, < 18.2.6
Fix: Upgrade joi to 17.13.7 or 18.2.6 (whichever matches your release line) or later.
Exploitation: No known exploitation

Why it is Amber

CVSS 7.5 high
Remotely exploitable without logging in
On your watchlist: npm

Affected packages

Package	Ecosystem	Vulnerable	Fixed in
joi	npm	>= 17.2.0, < 17.13.7	17.13.7
joi	npm	>= 18.0.0, < 18.2.6	18.2.6

References

Original description

### 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.

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