# CVE-2026-73086: nanoid: Integer Overflow or Wraparound

> CVE-2026-73086: nanoid: Integer Overflow or Wraparound. CVSS 7.4 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-73086
Last updated: 2026-10-24T15:10:00Z

- Published: 2026-08-11 16:46 UTC · Updated: 2026-10-24 15:10 UTC · Assigner: GitHub\_M
- CVSS: 7.4 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.30%, 22th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-190

## 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.

## Affected vendors and products

- ai: nanoid

## Tracked companies

- [Bitbucket](https://rewindex.com/company/bitbucket.md)
- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-73086)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-73086)
- [https://github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4](https://github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4)
- [https://github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3](https://github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3)
- [https://github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac](https://github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac)
- [https://github.com/ai/nanoid/releases/tag/3.3.12](https://github.com/ai/nanoid/releases/tag/3.3.12)
- [https://github.com/ai/nanoid/releases/tag/5.1.11](https://github.com/ai/nanoid/releases/tag/5.1.11)
- [https://github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w](https://github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-73086 · Markdown: https://rewindex.com/cve/CVE-2026-73086.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-73086 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:19.303Z