What’s Vulnerable › Vulnerabilities

CVE-2026-48038: joi: Uncaught RangeError on deeply nested input through recursive `link()` schemas

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-248

Description

joi is a schema description language and data validator for JavaScript. Prior to 17.13.4 and 18.2.1, denial of service is possible via an untrapped exception in services validating user-supplied JSON or object input with recursive link() schemas. When validate() is called without try/catch in a request handler, deeply nested input can trigger an unhandled RangeError and potentially crash the process; lower-impact paths using validateAsync() or try/catch produce a RangeError instead of a structured ValidationError. This issue is fixed in versions 17.13.4 and 18.2.1.

Affected products

• hapijs joi: before 17.13.4; from 18.0.0, < 18.2.1

References

• https://github.com/hapijs/joi/commit/97bd51de94d595a2d8949eb3bec0dbdd2f8a7a74
• https://github.com/hapijs/joi/commit/fc146a628ab9cc250854407722d9f8738c9548e7
• https://github.com/hapijs/joi/pull/3113
• https://github.com/hapijs/joi/security/advisories/GHSA-q7cg-457f-vx79

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