high5.9
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).
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | nanoid | < 3.3.16 | 3.3.16 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nanoid Project | Nanoid | before 3.3.16 from 4.0.0 before 5.1.16 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-28wg-ghj8-5hjv
- https://nvd.nist.gov/vuln/detail/CVE-2026-67214
- https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49
- https://github.com/ai/nanoid/releases/tag/5.1.16
- https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module
- https://github.com/ai/nanoid/pull/600
- https://github.com/ai/nanoid/pull/601
- https://github.com/ai/nanoid/commit/e835c9b71eab832bc6106944bdd26ea96cf2c66d
- https://github.com/ai/nanoid/releases/tag/3.3.16