What’s Vulnerable › Vulnerabilities

CVE-2021-23566: Information Exposure

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-14 · updated 2026-06-17
• Weakness: CWE-704

Description

The package nanoid from 3.0.0 and before 3.1.31 are vulnerable to Information Exposure via the valueOf() function which allows to reproduce the last id generated.

Affected products

• nanoid_project nanoid: from 3.0.0 before 3.1.31 — fixed in 3.1.31

How to fix

Upgrade to a fixed version: nanoid_project nanoid 3.1.31. Check the vendor advisory for mitigations.

References

• https://gist.github.com/artalar/bc6d1eb9a3477d15d2772e876169a444
• https://github.com/ai/nanoid/commit/2b7bd9332bc49b6330c7ddb08e5c661833db2575
• https://github.com/ai/nanoid/pull/328
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2332550
• https://snyk.io/vuln/SNYK-JS-NANOID-2332193
• https://gist.github.com/artalar/bc6d1eb9a3477d15d2772e876169a444
• https://github.com/ai/nanoid/commit/2b7bd9332bc49b6330c7ddb08e5c661833db2575
• https://github.com/ai/nanoid/pull/328
• https://lists.debian.org/debian-lts-announce/2024/12/msg00025.html
• https://lists.debian.org/debian-lts-announce/2025/01/msg00006.html
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2332550
• https://snyk.io/vuln/SNYK-JS-NANOID-2332193

Get alerted when CVE-2021-23566 or the next vulnerability affects your stack