GHSA-28wg-ghj8-5hjv nanoid: non-secure generators can loop indefinitely with negative size

• npm nanoid: < 3.3.16 → fixed in 3.3.16 • npm nanoid: >= 4.0.0, < 5.1.16 → fixed in 5.1.16

nanoid (Nano ID) before 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.