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CVE-2022-39209

7.5 · HIGH

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C.

Published Sep 15, 2022CWE-400EPSS 2.15%

Overview

CVE-2022-39209 is a high-severity vulnerability. It was published on September 15, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.

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

Refen.wikipedia.org/wiki/Time_complexityGitHubgithub.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655GitHubgithub.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7qReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIUCZN3PEKUCT2JQYQTYOVIJG2KSD6G7/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMGP65NANDVKPDMXMKYO2ZV2H2HZJY4P/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEAAAI4OULDYQ2TA3HOXH54PC3DCBFZS/Refen.wikipedia.org/wiki/Time_complexityGitHubgithub.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655GitHubgithub.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7qReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIUCZN3PEKUCT2JQYQTYOVIJG2KSD6G7/

How CyberStrike helps

Frequently asked questions

What is CVE-2022-39209?

CVE-2022-39209 is a high-severity vulnerability. It was published on September 15, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2022-39209?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-39209?

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-2022-39209?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-39209 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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