nanoid: Integer Overflow or Wraparound

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73086
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-11 17:19:16 UTC
Updated2026-08-11 17:19:16 UTC
Descriptionnanoid 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

Problem Types: CWE-190 | CWE-190 CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ai Nanoid affected < 3.3.12 Not specified
CNA Ai Nanoid affected >= 4.0.0, < 5.1.11 Not specified

References

ReferenceSourceLinkTags
github.com/ai/nanoid/commit/7087969281cab8ba8ae3babf1894e819068b3bb4 [email protected] github.com
github.com/ai/nanoid/commit/821dfed7b5db7f88e92f56c60eef32c8135077c3 [email protected] github.com
github.com/ai/nanoid/releases/tag/5.1.11 [email protected] github.com
github.com/ai/nanoid/releases/tag/3.3.12 [email protected] github.com
github.com/ai/nanoid/commit/b0036ed60dc9facd7f1191a50dfb3076500202ac [email protected] github.com
github.com/ai/nanoid/security/advisories/GHSA-xwg4-73v4-xw9w [email protected] github.com
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