What is CVE-2024-27088?

CVE-2024-27088 is a low-severity inefficient regular expression (ReDoS) vulnerability in es5-ext (npm), affecting versions >= 0.10.0, < 0.10.63. It is fixed in 0.10.63. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.

Which versions of es5-ext are affected by CVE-2024-27088?

es5-ext (npm) versions >= 0.10.0, < 0.10.63 is affected.

Is there a fix for CVE-2024-27088?

Yes. CVE-2024-27088 is fixed in 0.10.63. Upgrade to this version or later.

Is CVE-2024-27088 exploitable, and should I be worried?

Whether CVE-2024-27088 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-2024-27088 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-2024-27088?

Upgrade es5-ext to 0.10.63 or later.

CVE-2024-27088 in es5-ext

Q: Which versions of es5-ext are affected by CVE-2024-27088?

es5-ext (npm) versions >= 0.10.0, < 0.10.63 is affected.

Q: Is there a fix for CVE-2024-27088?

Yes. CVE-2024-27088 is fixed in 0.10.63. Upgrade to this version or later.

Q: Is CVE-2024-27088 exploitable, and should I be worried?

Whether CVE-2024-27088 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-2024-27088 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-2024-27088?

Upgrade es5-ext to 0.10.63 or later.

Summary

es5-ext vulnerable to Regular Expression Denial of Service in function#copy and function#toStringTokens

Workarounds

No real workaround aside of refraining from using above utilities.

References

https://github.com/medikoo/es5-ext/issues/201

Impact

Passing functions with very long names or complex default argument names into function#copy orfunction#toStringTokens may put script to stall

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.

Affected versions

es5-ext (>= 0.10.0, < 0.10.63)

Security releases

es5-ext → 0.10.63 (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

Fixed with https://github.com/medikoo/es5-ext/commit/3551cdd7b2db08b1632841f819d008757d28e8e2 and https://github.com/medikoo/es5-ext/commit/a52e95736690ad1d465ebcd9791d54570e294602
Published with v0.10.63

Frequently Asked Questions

What is CVE-2024-27088? CVE-2024-27088 is a low-severity inefficient regular expression (ReDoS) vulnerability in es5-ext (npm), affecting versions >= 0.10.0, < 0.10.63. It is fixed in 0.10.63. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.
Which versions of es5-ext are affected by CVE-2024-27088? es5-ext (npm) versions >= 0.10.0, < 0.10.63 is affected.
Is there a fix for CVE-2024-27088? Yes. CVE-2024-27088 is fixed in 0.10.63. Upgrade to this version or later.
Is CVE-2024-27088 exploitable, and should I be worried? Whether CVE-2024-27088 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-2024-27088 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-2024-27088? Upgrade es5-ext to 0.10.63 or later.