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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Patch
- https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Patch, Release Notes, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · nanoid_projectNVD modified 2026-10-08 16:17
Affected (CPE criteria) 1
cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:*
References 4
- 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