CVE-2026-67214

nanoid (Nano ID) before 3.3.16 and 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49	Patch
https://github.com/ai/nanoid/releases/tag/3.3.16	Product Release Notes
https://github.com/ai/nanoid/releases/tag/5.1.16	Product Release Notes
https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module	Patch Release Notes Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:nanoid_project:nanoid::::::node.js::*
	cpe:2.3:a:nanoid_project:nanoid::::::node.js::*

History

No history.

Information

Published : 2026-07-29 14:16

Updated : 2026-08-26 17:53

NVD link : CVE-2026-67214

Mitre link : CVE-2026-67214

CVE.ORG link : CVE-2026-67214

JSON object : View

Products Affected

nanoid_project

nanoid

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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