CVE-2026-67214
nanoid Infinite Loop via Negative Size in non-secure module
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.
INFO
Published Date :
July 29, 2026, 2:16 p.m.
Last Modified :
Oct. 23, 2026, 11:10 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 to version 5.1.16 or later.
- Avoid using negative sizes for nanoid functions.
- Validate user input for size parameters.
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-2026-67214.
| URL | Resource |
|---|---|
| https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 | Patch |
| https://github.com/ai/nanoid/releases/tag/3.3.16 | Product Release Notes |
| https://github.com/ai/nanoid/releases/tag/5.1.16 | Product Release Notes |
| https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module | 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-2026-67214 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-2026-67214
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-2026-67214 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-67214 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.
-
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: nanoid de nanoid_project, Description: nanoid (Nano ID) anterior a la versión 5.1.16 contiene un bucle infinito en las funciones customAlphabet y nanoid de su módulo no seguro (nanoid/non-secure). Cuando a estas funciones se les proporciona un tamaño negativo, el contador del bucle se decrementa desde un valor negativo y nunca alcanza su condición de terminación, girando indefinidamente y colgando el hilo de llamada. Una aplicación que pasa un tamaño negativo no validado y controlado por el atacante a estas funciones está expuesta a una condición de denegación de servicio. -
CVE Modified by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/67xxx/CVE-2026-67214.json">CVE-2026-67214</a> Added Reference https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Added Reference https://github.com/ai/nanoid/releases/tag/3.3.16 Added Reference https://github.com/ai/nanoid/releases/tag/5.1.16 Added Reference https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Removed Reference https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Removed Reference https://github.com/ai/nanoid/releases/tag/3.3.16 Removed Reference https://github.com/ai/nanoid/releases/tag/5.1.16 Removed Reference https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Removed Reference Type https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Types: Patch Removed Reference Type https://github.com/ai/nanoid/releases/tag/3.3.16 Types: Product, Release Notes Removed Reference Type https://github.com/ai/nanoid/releases/tag/5.1.16 Types: Product, Release Notes Removed Reference Type https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Types: Patch, Release Notes, Third Party Advisory -
Reanalysis by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.1.16 OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 4.0.0 up to (excluding) 5.1.16 -
Modified Analysis by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 5.1.16 OR *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.3.16 *cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.1.16 Added Reference Type VulnCheck: https://github.com/ai/nanoid/releases/tag/3.3.16 Types: Product, Release Notes -
CVE Modified by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'nanoid_project', 'product': 'nanoid', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.1.16', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] [{'vendor': 'nanoid_project', 'product': 'nanoid', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.1.16', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '3.3.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3.3.16', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Changed Description nanoid (Nano ID) before 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. 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. Added Reference https://github.com/ai/nanoid/releases/tag/3.3.16 -
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 up to (excluding) 5.1.16 Added Reference Type VulnCheck: https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Types: Patch Added Reference Type VulnCheck: https://github.com/ai/nanoid/releases/tag/5.1.16 Types: Product, Release Notes Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module Types: Patch, Release Notes, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-67214', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-29T14:37:09.751333Z'} -
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': '5.1.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.1.16', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description nanoid (Nano ID) before 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. 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/6ccc67bbaba71d3d77a21d9b636f4171a268ce49 Added Reference https://github.com/ai/nanoid/releases/tag/5.1.16 Added Reference https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module