What’s Vulnerable › Vulnerabilities

CVE-2018-3728: Prototype Pollution in hoek

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-03-30 · updated 2026-06-17
• Weakness: CWE-471

Description

hoek node module before 4.2.0 and 5.0.x before 5.0.3 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via 'merge' and 'applyToDefaults' functions, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.

Affected products

• hapi hoek node module: before 4.2.0; from 5.0.0 before 5.0.3 — fixed in 4.2.0, 5.0.3
• Npm Hoek: from 5.0.0 before 5.0.3; before 4.2.1 — fixed in 5.0.3, 4.2.1

How to fix

Upgrade to a fixed version: hapi hoek node module 4.2.0, 5.0.3; Npm Hoek 5.0.3, 4.2.1. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/103108
• https://access.redhat.com/errata/RHSA-2018:1263
• https://access.redhat.com/errata/RHSA-2018:1264
• https://github.com/hapijs/hoek/commit/32ed5c9413321fbc37da5ca81a7cbab693786dee
• https://hackerone.com/reports/310439
• https://nodesecurity.io/advisories/566
• https://snyk.io/vuln/npm:hoek:20180212
• http://www.securityfocus.com/bid/103108
• https://access.redhat.com/errata/RHSA-2018:1263
• https://access.redhat.com/errata/RHSA-2018:1264
• https://github.com/hapijs/hoek/commit/32ed5c9413321fbc37da5ca81a7cbab693786dee
• https://hackerone.com/reports/310439

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