ai nanoid up to 3.3.11/5.1.10 Fill Pool index.js size integer overflow

Summaryinfo

A vulnerability was found in ai nanoid up to 3.3.11/5.1.10. It has been declared as critical. The affected element is the function nanoid of the file index.js of the component Fill Pool. Such manipulation of the argument size leads to integer overflow. This vulnerability is documented as CVE-2026-73086. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ai nanoid up to 3.3.11/5.1.10. Affected by this issue is the function nanoid of the file index.js of the component Fill Pool. The manipulation of the argument size with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73086 since 08/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 3.3.12 or 5.1.11 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• ai

Name

• nanoid

Version

• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.3.10
• 3.3.11
• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4
• 5.1.5
• 5.1.6
• 5.1.7
• 5.1.8
• 5.1.9
• 5.1.10

Website

• Product: https://github.com/ai/nanoid/

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