CVE-2026-67214: nanoid Infinite Loop via Negative Size in non-secure module
Description
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.
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-835
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
nanoid_project: nanoid
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 (opens in new tab)
- github.com/ai/nanoid/releases/tag/3.3.16 (opens in new tab)
- github.com/ai/nanoid/releases/tag/5.1.16 (opens in new tab)
- www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secur… (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)