CVE-2026-67213
nanoid before 5.1.6 Infinite Loop via Zero Size in customAlphabet and customRandom
Description
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.
INFO
Published Date :
July 29, 2026, 2:16 p.m.
Last Modified :
Aug. 18, 2026, 2:26 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update nanoid dependency to version 5.1.6 or later.
- Ensure size parameter is always a positive integer.
- Validate all user-supplied sizes before passing to nanoid.
- Avoid using size 0 in customAlphabet and customRandom.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-67213.
| URL | Resource |
|---|---|
| https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7 | Patch |
| https://github.com/ai/nanoid/releases/tag/5.1.6 | Product Release Notes |
| https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-zero-size-in-customalphabet-and-customrandom | Patch Release Notes Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-67213 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-67213
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-67213 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-67213 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 3.0.0 up to (excluding) 3.3.17 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.1.6 Added Reference Type VulnCheck: https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7 Types: Patch Added Reference Type VulnCheck: https://github.com/ai/nanoid/releases/tag/5.1.6 Types: Product, Release Notes Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-zero-size-in-customalphabet-and-customrandom Types: Patch, Release Notes, Third Party Advisory -
CVE Modified by [email protected]
Aug. 10, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'nanoid_project', 'product': 'nanoid', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.1.6', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] [{'vendor': 'nanoid_project', 'product': 'nanoid', 'versions': [{'status': 'affected', 'version': '3.0.0', 'lessThan': '3.3.17', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.0.0', 'lessThan': '5.1.6', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-67213', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-29T14:41:51.480372Z'} -
New CVE Received by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'nanoid_project', 'product': 'nanoid', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.1.6', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-835 Added Reference https://github.com/ai/nanoid/commit/cb3626d0f3342fdf179cd425fd9c4fbb92c7d0e7 Added Reference https://github.com/ai/nanoid/releases/tag/5.1.6 Added Reference https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-zero-size-in-customalphabet-and-customrandom