What is CVE-2020-26309?

CVE-2020-26309 is a medium-severity inefficient regular expression (ReDoS) vulnerability in nope-validator (npm), affecting versions < 0.12.1. It is fixed in 0.12.1. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.

Which versions of nope-validator are affected by CVE-2020-26309?

nope-validator (npm) versions < 0.12.1 is affected.

Is there a fix for CVE-2020-26309?

Yes. CVE-2020-26309 is fixed in 0.12.1. Upgrade to this version or later.

Is CVE-2020-26309 exploitable, and should I be worried?

Whether CVE-2020-26309 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-2020-26309 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-2020-26309 in nope-validator

Q: Which versions of nope-validator are affected by CVE-2020-26309?

nope-validator (npm) versions < 0.12.1 is affected.

Q: Is there a fix for CVE-2020-26309?

Yes. CVE-2020-26309 is fixed in 0.12.1. Upgrade to this version or later.

Q: Is CVE-2020-26309 exploitable, and should I be worried?

Whether CVE-2020-26309 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-2020-26309 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-2020-26309?

Upgrade nope-validator to 0.12.1 or later.

CVE-2020-26309

CVE-2020-26309 is a medium-severity inefficient regular expression (ReDoS) vulnerability in nope-validator (npm), affecting versions < 0.12.1. It is fixed in 0.12.1.

Does this CVE actually affect you?

Kodem shows which CVEs are reachable and running in your applications, so you fix what's exploitable, not just what's listed.

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Runtime intelligence, not another scanner.

Summary

nope-validator Regular Expression Denial of Service vulnerability

Nope is a JavaScript validator. Versions 0.11.3 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). This vulnerability is fixed in 0.12.1.

Impact

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

nope-validator (< 0.12.1)

Security releases

nope-validator → 0.12.1 (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 nope-validator to 0.12.1 or later to resolve this vulnerability.

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

Frequently Asked Questions

What is CVE-2020-26309? CVE-2020-26309 is a medium-severity inefficient regular expression (ReDoS) vulnerability in nope-validator (npm), affecting versions < 0.12.1. It is fixed in 0.12.1. A regular expression with worst-case exponential or polynomial matching time is applied to untrusted input, causing excessive CPU use.
Which versions of nope-validator are affected by CVE-2020-26309? nope-validator (npm) versions < 0.12.1 is affected.
Is there a fix for CVE-2020-26309? Yes. CVE-2020-26309 is fixed in 0.12.1. Upgrade to this version or later.
Is CVE-2020-26309 exploitable, and should I be worried? Whether CVE-2020-26309 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-2020-26309 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-2020-26309? Upgrade nope-validator to 0.12.1 or later.