Summary
Predictable results in nanoid generation when given non-integer values
When nanoid is called with a fractional value, there were a number of undesirable effects:
- in browser and non-secure, the code infinite loops on while (size--)
- in node, the value of poolOffset becomes fractional, causing calls to nanoid to return zeroes until the pool is next filled
- if the first call in node is a fractional argument, the initial buffer allocation fails with an error
Version 3.3.8 and 5.0.9 are fixed.
Impact
CVE-2024-55565 has a CVSS score of 4.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.0.9, 3.3.8); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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nanoid to 5.0.9 or later; nanoid to 3.3.8 or later
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2024-55565? CVE-2024-55565 is a medium-severity security vulnerability in nanoid (npm), affecting versions >= 4.0.0, < 5.0.9. It is fixed in 5.0.9, 3.3.8.
- How severe is CVE-2024-55565? CVE-2024-55565 has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of nanoid are affected by CVE-2024-55565? nanoid (npm) versions >= 4.0.0, < 5.0.9 is affected.
- Is there a fix for CVE-2024-55565? Yes. CVE-2024-55565 is fixed in 5.0.9, 3.3.8. Upgrade to this version or later.
- Is CVE-2024-55565 exploitable, and should I be worried? Whether CVE-2024-55565 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2024-55565 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2024-55565?
- Upgrade
nanoidto 5.0.9 or later - Upgrade
nanoidto 3.3.8 or later
- Upgrade