CVE-2026-67213
Description
A flaw was found in nanoid (Nano ID), a small, secure, and URL-friendly unique string ID generator. An attacker could exploit this vulnerability by providing a zero-size input to the customAlphabet or customRandom functions. This would cause an infinite loop, leading to a denial of service (DoS) condition by hanging the application's calling thread.
Statement
An algorithmic denial of service flaw was found in the nanoid library. When calling customAlphabet or customRandom with a size parameter of 0, the internal generation loop fails to meet its termination condition. In Node.js or browser execution contexts, an attacker who supplies an unvalidated, zero-value size parameter to these functions causes the thread to enter an infinite loop, driving CPU utilization to 100% and completely blocking event loop execution for that thread.
Mitigation
To mitigate this issue, ensure application code validates the size parameter passed to customAlphabet or customRandom, rejecting or sanitizing zero-value inputs before passing them to nanoid.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Amplification
An infinite loop will cause unexpected consumption of resources, such as CPU cycles or memory. The software's operation may slow down, or cause a long time to respond.
Frequently Asked Questions
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