# CVE-2026-67214: nanoid Infinite Loop via Negative Size in non-secure module

> CVE-2026-67214: nanoid Infinite Loop via Negative Size in non-secure module. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-67214
Last updated: 2026-10-23T23:10:00Z

- Published: 2026-07-29 13:32 UTC · Updated: 2026-10-23 23:10 UTC · Assigner: VulnCheck
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.33%, 26th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-835

## Description

nanoid (Nano ID) before 3.3.16 and 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.

## Affected vendors and products

- nanoid\_project: nanoid

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-67214)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-67214)
- [https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49](https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49)
- [https://github.com/ai/nanoid/releases/tag/3.3.16](https://github.com/ai/nanoid/releases/tag/3.3.16)
- [https://github.com/ai/nanoid/releases/tag/5.1.16](https://github.com/ai/nanoid/releases/tag/5.1.16)
- [https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module](https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-67214 · Markdown: https://rewindex.com/cve/CVE-2026-67214.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-67214 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:18.731Z