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CVE-2026-122131— Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 Prototype Replacement via __proto__ Language Key

Quick assessment

Affected
hapijs joi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joi 17.13.6 至 17.13.9 之前版本，以及 18.2.5 至 18.3.1 之前版本，在 中的 和 函数存在原型污染漏洞。该漏洞未能正确拒绝包含 的语言键。攻击者可通过 、 、验证选项或 提供不可信的消息配置，从而替换已编译消息的原型，进而篡改或破坏验证错误的渲染逻辑及依赖该逻辑的功能。

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-122131

Vulnerability Information
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Vulnerability Title
Joi 17.13.6 before 17.13.9 and 18.2.5 before 18.3.1 Prototype Replacement via __proto__ Language Key
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hapijs joi 17.13.6 ~ 17.13.9 -

II. Public POCs for CVE-2026-122131

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III. Intelligence Information for CVE-2026-122131

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Vendor Advisories for CVE-2026-122131 (1)

Other References for CVE-2026-122131 (1)

Other References for CVE-2026-122131 (5)

IV. Related Vulnerabilities

Same product: joi
Same vendor: hapijs
Same weakness: CWE-1321