Vulnerability record · CVE-2026-73086 · published 11 August 2026

CVE-2026-73086: Integer overflow vulnerability

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.

7.4 CVSS 3.1 High EPSS 0.30% · top 80.0% CWE-190 · Integer overflow Deferred

7.4CVSS 3.1 base score

0.30%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

6References

9 Sep 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Link	Tags
https://github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4
https://github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3
https://github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac
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/security/advisories/GHSA-xwg4-73v4-xw9w

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Source: NIST National Vulnerability Database (record CVE-2026-73086), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.