High severity7.4NVD Advisory· Published Aug 11, 2026· Updated Sep 9, 2026
CVE-2026-73086
CVE-2026-73086
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
nanoidnpm | < 3.3.12 | 3.3.12 |
nanoidnpm | >= 4.0.0, < 5.1.11 | 5.1.11 |
Affected products
3Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-xwg4-73v4-xw9wghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-73086ghsaADVISORY
- github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4nvdWEB
- github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3nvdWEB
- github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202acnvdWEB
- github.com/ai/nanoid/releases/tag/3.3.12nvdWEB
- github.com/ai/nanoid/releases/tag/5.1.11nvdWEB
- github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9wnvdWEB
News mentions
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