Which versions of libyaml are affected by CVE-2013-6393?

libyaml (npm) versions < 0.2.3 is affected.

Is there a fix for CVE-2013-6393?

Yes. CVE-2013-6393 is fixed in 0.2.3. Upgrade to this version or later.

Is CVE-2013-6393 exploitable, and should I be worried?

Whether CVE-2013-6393 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-2013-6393 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-2013-6393?

Upgrade libyaml to 0.2.3 or later.

CVE-2013-6393 in libyaml

Q: What is CVE-2013-6393?

CVE-2013-6393 is a critical-severity security vulnerability in libyaml (npm), affecting versions < 0.2.3. It is fixed in 0.2.3.

Q: Is there a fix for CVE-2013-6393?

Yes. CVE-2013-6393 is fixed in 0.2.3. Upgrade to this version or later.

Q: Is CVE-2013-6393 exploitable, and should I be worried?

Whether CVE-2013-6393 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-2013-6393 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-2013-6393?

Upgrade libyaml to 0.2.3 or later.

CVE-2013-6393

CVE-2013-6393 is a critical-severity security vulnerability in libyaml (npm), affecting versions < 0.2.3. It is fixed in 0.2.3.

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

Heap Based Buffer Overflow in libyaml

Versions 0.2.2 and earlier depend on native libyaml version 0.1.5 or earlier. As such, they are affected by a heap-based buffer overflow vulnerability that may result in a crash or arbitrary code execution when parsing YAML tags.

Impact

Affected versions

libyaml (< 0.2.3)

Security releases

libyaml → 0.2.3 (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

Update to version 0.2.3 that includes a version of LibYAML that contains a fix for this issue.

Frequently Asked Questions

What is CVE-2013-6393? CVE-2013-6393 is a critical-severity security vulnerability in libyaml (npm), affecting versions < 0.2.3. It is fixed in 0.2.3.
Which versions of libyaml are affected by CVE-2013-6393? libyaml (npm) versions < 0.2.3 is affected.
Is there a fix for CVE-2013-6393? Yes. CVE-2013-6393 is fixed in 0.2.3. Upgrade to this version or later.
Is CVE-2013-6393 exploitable, and should I be worried? Whether CVE-2013-6393 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-2013-6393 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-2013-6393? Upgrade libyaml to 0.2.3 or later.