CVE-2026-67213nanoid before 5.1.6 Infinite Loop via Zero Size in customAlphabet and customRandom
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and customRandom functions. When these functions are configured with a size of 0, the internal generation loop never satisfies its exit condition and spins indefinitely, hanging the calling thread. An application that passes an unvalidated, attacker-controlled size of 0 to these functions is exposed to a denial-of-service condition.
- CVSS
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-835
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nanoid_project nanoid nanoid_project:nanoid (from the name) | from 3.0.0 before 3.3.17; from 5.0.0 before 5.1.6 | CNA record |
nanoid_project nanoid nanoid_project:nanoid | from 3.0.0 before 3.3.17; from 5.0.0 before 5.1.6 | NVD |
References
- https://github.com/ai/nanoid/releases/tag/5.1.6release-notes
- https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7patch
- https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-zero-size-in-customalphabet-and-customrandomthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.