CVE-2026-67213: Nanoid Project Nanoid

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and customRandom functions. When these functions are configured with a size of 0, the internal generation loop never satisfies its exit condition and spins indefinitely, hanging the calling thread. An application that passes an unvalidated, attacker-controlled size of 0 to these functions is exposed to a denial-of-service condition.

Affected products

• Nanoid Project Nanoid: from 3.0.0, before 3.3.17 (fixed in 3.3.17); from 5.0.0, before 5.1.6 (fixed in 5.1.6)

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