What is CVE-2023-22467?

CVE-2023-22467 is a high-severity inefficient regular expression (ReDoS) vulnerability in luxon (npm), affecting versions >= 2.0.0, < 2.5.2. It is fixed in 2.5.2, 3.2.1, 1.28.1. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.

How severe is CVE-2023-22467?

CVE-2023-22467 has a CVSS score of 7.5 (High). 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 luxon are affected by CVE-2023-22467?

luxon (npm) versions >= 2.0.0, < 2.5.2 is affected.

Is there a fix for CVE-2023-22467?

Yes. CVE-2023-22467 is fixed in 2.5.2, 3.2.1, 1.28.1. Upgrade to this version or later.

Is CVE-2023-22467 exploitable, and should I be worried?

Whether CVE-2023-22467 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.

What actually determines whether CVE-2023-22467 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.

CVE-2023-22467 in luxon

Q: How severe is CVE-2023-22467?

CVE-2023-22467 has a CVSS score of 7.5 (High). 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.

Q: Which versions of luxon are affected by CVE-2023-22467?

luxon (npm) versions >= 2.0.0, < 2.5.2 is affected.

Q: Is there a fix for CVE-2023-22467?

Yes. CVE-2023-22467 is fixed in 2.5.2, 3.2.1, 1.28.1. Upgrade to this version or later.

Q: Is CVE-2023-22467 exploitable, and should I be worried?

Whether CVE-2023-22467 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.

Q: What actually determines whether CVE-2023-22467 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.

Q: How do I fix CVE-2023-22467?

Upgrade: luxon to 2.5.2 or later, luxon to 3.2.1 or later, luxon to 1.28.1 or later.

Summary

Luxon Inefficient Regular Expression Complexity vulnerability

Workarounds

Limit the length of the input.

References

There is an excellent writeup of the same issue in Moment: https://github.com/moment/moment/pull/6015#issuecomment-1152961973

Details

DateTime.fromRFC2822("(".repeat(500000)) takes a couple minutes to complete.

Impact

Luxon's `DateTime.fromRFC2822() has quadratic (N^2) complexity on some specific inputs. This causes a noticeable slowdown for inputs with lengths above 10k characters. Users providing untrusted data to this method are therefore vulnerable to (Re)DoS attacks.

This is the same bug as Moment's https://github.com/moment/moment/security/advisories/GHSA-wc69-rhjr-hc9g

A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use. Typical impact: denial of service when input is crafted to trigger backtracking.

CVE-2023-22467 has a CVSS score of 7.5 (High). The vector is network-reachable, no 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 (2.5.2, 3.2.1, 1.28.1); upgrading removes the vulnerable code path.

Affected versions

luxon (>= 2.0.0, < 2.5.2) luxon (>= 3.0.0, < 3.2.1) luxon (>= 1.0.0, < 1.28.1)

Security releases

luxon → 2.5.2 (npm) luxon → 3.2.1 (npm) luxon → 1.28.1 (npm)

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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Remediation advice

Upgrade the following packages to resolve this vulnerability:

luxon to 2.5.2 or later; luxon to 3.2.1 or later; luxon to 1.28.1 or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2023-22467? CVE-2023-22467 is a high-severity inefficient regular expression (ReDoS) vulnerability in luxon (npm), affecting versions >= 2.0.0, < 2.5.2. It is fixed in 2.5.2, 3.2.1, 1.28.1. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.
How severe is CVE-2023-22467? CVE-2023-22467 has a CVSS score of 7.5 (High). 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 luxon are affected by CVE-2023-22467? luxon (npm) versions >= 2.0.0, < 2.5.2 is affected.
Is there a fix for CVE-2023-22467? Yes. CVE-2023-22467 is fixed in 2.5.2, 3.2.1, 1.28.1. Upgrade to this version or later.
Is CVE-2023-22467 exploitable, and should I be worried? Whether CVE-2023-22467 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-2023-22467 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-2023-22467?
- Upgrade luxon to 2.5.2 or later
- Upgrade luxon to 3.2.1 or later
- Upgrade luxon to 1.28.1 or later