Detections
Analytics
CVE-2026-73086
high
Description
nanoid is a secure, URL-friendly, unique string ID generator for JavaScript. Prior to versions 3.3.12 and 5.1.11, the nanoid(size) function in index.js and index.cjs coerces the user-influenced size parameter to a signed 32-bit integer, allowing a value of 2147483648 to become -2147483648 and corrupt the process-wide CSPRNG poolOffset in fillPool(), which causes subsequent session tokens, CSRF tokens, API keys, and unique identifiers to become the deterministic string "uuuuuuuuuuuuuuuuuuuuu" until the process restarts. This issue is fixed in versions 3.3.12 and 5.1.11.
References
https://github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w
https://github.com/ai/nanoid/releases/tag/5.1.11
https://github.com/ai/nanoid/releases/tag/3.3.12
https://github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac
https://github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3
https://github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4