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CVE-2026-90771— joi before 17.13.8 and 18.2.9 Prototype Pollution via messages

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.

hapi.js joi是hapi.js组织的一款JavaScript对象模式验证库。 hapijs joi 17.13.8之前版本和18.2.9之前版本存在输入验证错误漏洞，该漏洞源于messages编译函数接受__proto__作为错误码，可能导致原型污染，攻击者可通过自定义消息中的__proto__键替换返回对象的原型，破坏依赖Object.prototype方法的下游代码。

CVSS 3.7 · Low EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1559.001 · Component Object Model

Affected Version Matrix 2

VendorProduct Version RangeStatus
hapijs joi 16.0.0< 17.13.8 affected
18.0.0< 18.2.9 affected
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I. Basic Information for CVE-2026-90771

Vulnerability Information
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Vulnerability Title
joi before 17.13.8 and 18.2.9 Prototype Pollution via messages
Source: CVE Program / CVE List V5
Vulnerability Description
joi before versions 17.13.8 and 18.2.9 contains a prototype pollution vulnerability in the messages compilation function that accepts __proto__ as an error code. Attackers can supply __proto__ keys in custom messages to replace the returned object's prototype, breaking downstream code relying on Object.prototype methods.
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
Vulnerability Title
hapijs joi 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hapi.js joi是hapi.js组织的一款JavaScript对象模式验证库。 hapijs joi 17.13.8之前版本和18.2.9之前版本存在输入验证错误漏洞，该漏洞源于messages编译函数接受__proto__作为错误码，可能导致原型污染，攻击者可通过自定义消息中的__proto__键替换返回对象的原型，破坏依赖Object.prototype方法的下游代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hapijs joi 16.0.0 ~ 17.13.8 -

II. Public POCs for CVE-2026-90771

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III. Intelligence Information for CVE-2026-90771

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Patches & Fixes for CVE-2026-90771 (1)

Vendor Advisories for CVE-2026-90771 (1)

Proof of Concept for CVE-2026-90771 (1)

Other References for CVE-2026-90771 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-90771

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