What is CVE-2020-36443?

CVE-2020-36443 is a critical-severity security vulnerability in libp2p-deflate (rust), affecting versions < 0.27.1. It is fixed in 0.27.1.

How severe is CVE-2020-36443?

CVE-2020-36443 has a CVSS score of 9.8 (Critical). 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 libp2p-deflate are affected by CVE-2020-36443?

libp2p-deflate (rust) versions < 0.27.1 is affected.

Is there a fix for CVE-2020-36443?

Yes. CVE-2020-36443 is fixed in 0.27.1. Upgrade to this version or later.

Is CVE-2020-36443 exploitable, and should I be worried?

Whether CVE-2020-36443 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-2020-36443 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-2020-36443 in libp2p-deflate

Q: How severe is CVE-2020-36443?

CVE-2020-36443 has a CVSS score of 9.8 (Critical). 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 libp2p-deflate are affected by CVE-2020-36443?

libp2p-deflate (rust) versions < 0.27.1 is affected.

Q: Is there a fix for CVE-2020-36443?

Yes. CVE-2020-36443 is fixed in 0.27.1. Upgrade to this version or later.

Q: Is CVE-2020-36443 exploitable, and should I be worried?

Whether CVE-2020-36443 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-2020-36443 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-2020-36443?

Upgrade libp2p-deflate to 0.27.1 or later.

Summary

Use of Uninitialized Resource in libp2p-deflate

An issue was discovered in the libp2p-deflate crate before 0.27.1 for Rust. An uninitialized buffer is passed to AsyncRead::poll_read(), which is a user-provided trait function.

Impact

CVE-2020-36443 has a CVSS score of 9.8 (Critical). 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 (0.27.1); upgrading removes the vulnerable code path.

Affected versions

libp2p-deflate (< 0.27.1)

Security releases

libp2p-deflate → 0.27.1 (rust)

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 libp2p-deflate to 0.27.1 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-2020-36443? CVE-2020-36443 is a critical-severity security vulnerability in libp2p-deflate (rust), affecting versions < 0.27.1. It is fixed in 0.27.1.
How severe is CVE-2020-36443? CVE-2020-36443 has a CVSS score of 9.8 (Critical). 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 libp2p-deflate are affected by CVE-2020-36443? libp2p-deflate (rust) versions < 0.27.1 is affected.
Is there a fix for CVE-2020-36443? Yes. CVE-2020-36443 is fixed in 0.27.1. Upgrade to this version or later.
Is CVE-2020-36443 exploitable, and should I be worried? Whether CVE-2020-36443 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-2020-36443 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-2020-36443? Upgrade libp2p-deflate to 0.27.1 or later.