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CVE-2026-73086— nanoid: Integer Overflow or Wraparound

Quick assessment

Affected
ai nanoid
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Andrey Sitnik Nano ID是Andrey Sitnik个人开发者的一个生成唯一标识符的前端库。 Andrey Sitnik Nano ID 3.3.12之前版本和5.1.11之前版本存在数字错误漏洞，该漏洞源于nanoid(size)函数在index.js和index.cjs中将用户控制的size参数强制转换为有符号32位整数，导致整数溢出，破坏进程范围的CSPRNG poolOffset，可能导致后续会话令牌、CSRF令牌、API密钥和唯一标识符变成确定性字符串。

CVSS 7.4 · High EPSS 0.30% · P22

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 2

VendorProduct Version RangeStatus
ai nanoid < 3.3.12 affected
>= 4.0.0, < 5.1.11 affected
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I. Basic Information for CVE-2026-73086

Vulnerability Information
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Vulnerability Title
nanoid: Integer Overflow or Wraparound
Source: CVE Program / CVE List V5
Vulnerability Description
nanoid is a secure, URL-friendly, unique string ID generator for JavaScript. Prior to versions 3.3.12 and 5.1.11, the nanoid(size) function in index.js and index.cjs coerces the user-influenced size parameter to a signed 32-bit integer, allowing a value of 2147483648 to become -2147483648 and corrupt the process-wide CSPRNG poolOffset in fillPool(), which causes subsequent session tokens, CSRF tokens, API keys, and unique identifiers to become the deterministic string "uuuuuuuuuuuuuuuuuuuuu" until the process restarts. This issue is fixed in versions 3.3.12 and 5.1.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Andrey Sitnik Nano ID 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Andrey Sitnik Nano ID是Andrey Sitnik个人开发者的一个生成唯一标识符的前端库。 Andrey Sitnik Nano ID 3.3.12之前版本和5.1.11之前版本存在数字错误漏洞，该漏洞源于nanoid(size)函数在index.js和index.cjs中将用户控制的size参数强制转换为有符号32位整数，导致整数溢出，破坏进程范围的CSPRNG poolOffset，可能导致后续会话令牌、CSRF令牌、API密钥和唯一标识符变成确定性字符串。
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
ai nanoid < 3.3.12 -

II. Public POCs for CVE-2026-73086

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8195 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-73086

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Patches & Fixes for CVE-2026-73086 (3)

Vendor Advisories for CVE-2026-73086 (1)

Vendor Pages for CVE-2026-73086 (1)

Other References for CVE-2026-73086 (1)

IV. Related Vulnerabilities

Same product: nanoid
Same weakness: CWE-190

V. Comments for CVE-2026-73086

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