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CVE-2026-67213— nanoid before 5.1.6 Infinite Loop via Zero Size in customAlphabet and customRandom

Quick assessment

Affected
nanoid_project nanoid
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.

Andrey Sitnik nanoid是Andrey Sitnik个人开发者开源的一个用于 JavaScript 的小型、安全、URL 友好、唯一的字符串 ID 生成器。 Andrey Sitnik Nano ID 5.1.6之前版本存在资源管理错误漏洞，该漏洞源于customAlphabet和customRandom函数存在无限循环，当这些函数配置size为0时，内部生成循环永远无法满足退出条件，导致线程挂起，可能造成拒绝服务。

CVSS 5.9 · Medium EPSS 0.59% · P46

Affected Version Matrix 2

VendorProduct Version RangeStatus
nanoid_project nanoid 3.0.0< 3.3.17 affected
5.0.0< 5.1.6 affected
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I. Basic Information for CVE-2026-67213

Vulnerability Information
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Vulnerability Title
nanoid before 5.1.6 Infinite Loop via Zero Size in customAlphabet and customRandom
Source: CVE Program / CVE List V5
Vulnerability Description
nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and customRandom functions. When these functions are configured with a size of 0, the internal generation loop never satisfies its exit condition and spins indefinitely, hanging the calling thread. An application that passes an unvalidated, attacker-controlled size of 0 to these functions is exposed to a denial-of-service condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Andrey Sitnik Nano ID 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Andrey Sitnik nanoid是Andrey Sitnik个人开发者开源的一个用于 JavaScript 的小型、安全、URL 友好、唯一的字符串 ID 生成器。 Andrey Sitnik Nano ID 5.1.6之前版本存在资源管理错误漏洞，该漏洞源于customAlphabet和customRandom函数存在无限循环，当这些函数配置size为0时，内部生成循环永远无法满足退出条件，导致线程挂起，可能造成拒绝服务。
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
nanoid_project nanoid 3.0.0 ~ 3.3.17 -

II. Public POCs for CVE-2026-67213

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III. Intelligence Information for CVE-2026-67213

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Patches & Fixes for CVE-2026-67213 (1)

Vendor Advisories for CVE-2026-67213 (1)

Vendor Pages for CVE-2026-67213 (1)

IV. Related Vulnerabilities

Same product: nanoid
Same vendor: nanoid_project
Same weakness: CWE-835

V. Comments for CVE-2026-67213

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