CVE-2026-73086: nanoid: Integer Overflow or Wraparound
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.
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N · CWE-190
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
ai: nanoid
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4 (opens in new tab)
- github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3 (opens in new tab)
- github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac (opens in new tab)
- github.com/ai/nanoid/releases/tag/3.3.12 (opens in new tab)
- github.com/ai/nanoid/releases/tag/5.1.11 (opens in new tab)
- github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)