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CVE-2021-39194

4.3 · MEDIUM

kaml is an open source implementation of the YAML format with support for kotlinx.serialization.

Published Sep 7, 2021CWE-835EPSS 1.66%

Overview

CVE-2021-39194 is a medium-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

kaml is an open source implementation of the YAML format with support for kotlinx.serialization. In affected versions attackers that could provide arbitrary YAML input to an application that uses kaml could cause the application to endlessly loop while parsing the input. This could result in resource starvation and denial of service. This only affects applications that use polymorphic serialization with the default tagged polymorphism style. Applications using the property polymorphism style are not affected. YAML input for a polymorphic type that provided a tag but no value for the object would trigger the issue. Version 0.35.3 or later contain the fix for this issue.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6aGitHubgithub.com/charleskorn/kaml/issues/179GitHubgithub.com/charleskorn/kaml/security/advisories/GHSA-fmm9-3gv8-58f4GitHubgithub.com/charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6aGitHubgithub.com/charleskorn/kaml/issues/179GitHubgithub.com/charleskorn/kaml/security/advisories/GHSA-fmm9-3gv8-58f4

How CyberStrike helps

Frequently asked questions

What is CVE-2021-39194?

CVE-2021-39194 is a medium-severity vulnerability. It was published on September 7, 2021 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2021-39194?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-39194?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-39194?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-39194 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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