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    CVE-2026-122131

    Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 contains a prototype pollution vulnerability in lib/messages.js compile() and merge() that fails to reject a __proto__ language key. Attackers supplying untrusted message configuration via any().messages(), prefs, validate options or Joi.extend can replace the compiled messages prototype, altering or breaking validation error rendering and dependent logic.

    Published:Nov 4, 2026
    Last Modified:Nov 4, 2026
    EPS:Nov 4, 2026
    EPSS Score:
    CVSS Score:3.7

    Affected Products

    Vendor
    Hapijs
    Product
    Joi

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-118772 (CVSS 7.5) — joi is a schema description language and data validator for JavaScript. From 17.1.1 until 17.13.9 and 18.3.1, …
    CVE-2026-92599 (CVSS 8.7) — joi (npm package `joi`, hapi.js) versions >=17.2.0 <17.13.7 and >=18.0.0 <18.2.6 are vulnerable to regular exp…
    CVE-2026-90771 (CVSS 6.3) — joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilatio…
    CVE-2026-84368 (CVSS 3.7) — joi is a schema description language and data validator for JavaScript. From 16.0.0 until 17.13.6 and 18.2.5, …
    CVE-2026-84367 (CVSS 3.7) — joi is a schema description language and data validator for JavaScript. From 16.0.0 until 17.13.5 and 18.2.4, …
    CVE-2026-48038 (CVSS 5.3) — joi is a schema description language and data validator for JavaScript. Prior to 17.13.4 and 18.2.1, denial of…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High