CVE-2020-5238

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CVSS 3.1

6.5 medium

EPSS

2%p74

Published

Jul 1, 2020 (Jul 1, 2020)

Modified

Jun 17, 2026

Description

The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project. The issue has been fixed in version 0.29.0.gfm.1.

Vendors: github flavored markdown project fedoraproject
Products: github flavored markdown, fedora
Weakness: CWE-20
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.6%)

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