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CVE-2026-118772— joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service

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 是用于 JavaScript 的模式描述语言和数据验证库。在 17.1.1 至 17.13.9 以及 18.3.1 版本中， 规则所使用的分隔符正则表达式，其前导空白字符的量词会在不包含分隔符的长空白序列中，于每个位置重复尝试匹配，从而导致 执行二次方（O(n²)）复杂度的操作。该行为既适用于默认分隔符，也适用于任何自定义分隔符。若应用程序使用 选项验证由攻击者控制的数据，且未实施有效的输入长度限制，则单个请求即可阻塞 Node.js 事件循环数秒，致使其他任务无法执行。仅添加 规则并不足够，因为当 时，即

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
@hapi joi >= 16.0.0, <= 17.1.1 affected
hapijs joi >= 16.0.0, <= 17.1.1 affected
>= 18.0.0, < 18.3.1 affected
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I. Basic Information for CVE-2026-118772

Vulnerability Information
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Vulnerability Title
joi: quadratic-time split in `string().email({ multiple: true })` allows denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
joi is a schema description language and data validator for JavaScript. From 17.1.1 until 17.13.9 and 18.3.1, the Joi.string().email({ multiple: true }) rule uses a separator regular expression whose leading whitespace quantifier is retried at every position in a long whitespace run that contains no separator, causing quadratic work during String.prototype.split. The behavior applies to the default separator and every custom separator. Applications that validate attacker-controlled values with the multiple option and no effective prior length limit can have the Node.js event loop blocked for seconds by one request, preventing other work. A .max() rule is not sufficient when abortEarly: false allows the email rule to run after the maximum-length check fails. This vulnerability is fixed in versions 17.13.9 and 18.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hapijs joi >= 16.0.0, <= 17.1.1 -
@hapi joi >= 16.0.0, <= 17.1.1 -

II. Public POCs for CVE-2026-118772

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III. Intelligence Information for CVE-2026-118772

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Patches & Fixes for CVE-2026-118772 (3)

Vendor Advisories for CVE-2026-118772 (1)

Vendor Pages for CVE-2026-118772 (2)

IV. Related Vulnerabilities

Same product: joi
Same vendor: hapijs
Same weakness: CWE-1333