CVE-2026-67214: Nanoid Project Nanoid

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Nanoid Project Nanoid: before 3.3.16 (fixed in 3.3.16); from 4.0.0, before 5.1.16 (fixed in 5.1.16)

Published 2026-07-29. Last modified 2026-10-08.