Vulnerability GHSA-6h2x-m376-mqjq
High Risk
HIGH RISK
CVSS Score: 7.5
Score Range: 7.0–8.9
High severity vulnerabilities (CVSS 7.0–8.9). Serious vulnerabilities that should be prioritized soon after critical fixes.
6 days ago
September 29, 2026 at 06:07 PM UTC
joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()`
17.2.0 - 17.13.6 and 18.0.0 - 18.2.5
17.2.0 - 17.13.6 and 18.0.0 - 18.2.5
Summary
joi: Quadratic regular-expression backtracking in `Joi.string().isoDate()`
Details
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.
Related Vulnerabilities
Other vulnerabilities affecting the same packages
Low Risk
22 days ago
joi messages compilation allows prototype replacement through __proto__ error codes
0.0.1 - 17.13.7 and 18.0.0 - 18.2.8 GHSA-wr44-6hxh-3jwq
0.0.1 - 17.13.7 and 18.0.0 - 18.2.8 GHSA-wr44-6hxh-3jwq
Low Risk
27 days ago
joi: Prototype pollution via a `__proto__` language key in custom messages
17.2.0 - 17.13.5 and 18.0.0 - 18.2.4 GHSA-6w3j-5fw6-r9vr
17.2.0 - 17.13.5 and 18.0.0 - 18.2.4 GHSA-6w3j-5fw6-r9vr
Low Risk
27 days ago
joi: object().rename() with a template target can set the validated object's prototype
17.1.1 - 17.13.4 and 18.0.0 - 18.2.3 GHSA-gg4h-3hg2-grpc
17.1.1 - 17.13.4 and 18.0.0 - 18.2.3 GHSA-gg4h-3hg2-grpc
Medium Risk
3 months ago
joi has an uncaught RangeError on deeply nested input through recursive `link()` schemas
0.0.1 - 17.13.3 and 18.0.0 - 18.2.0 GHSA-q7cg-457f-vx79
0.0.1 - 17.13.3 and 18.0.0 - 18.2.0 GHSA-q7cg-457f-vx79
Impacted packages
Timeline
Published
6 days ago
September 29, 2026 at 06:07 PM UTC
Fixed (18.2.6)
1 month ago
September 02, 2026 at 09:46 AM UTC
Fixed (17.13.7)
1 month ago
September 02, 2026 at 09:47 AM UTC
Last Modified
7 hours ago
October 05, 2026 at 11:45 PM UTC