CVE-2020-5238

Denial of service in table parsing in cmark-gfm

State: Published
Severity: 6.5 Medium
Published: Jul 1, 2020
Updated: Aug 4, 2024
Reserved: Jan 2, 2020

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
cmark-gfmgithub	< 0.29.0.gfm.1Affected

References

https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85
https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4
FEDORA-2020-c39d7a562cvendor-advisory
FEDORA-2020-1eaffe0013vendor-advisory
FEDORA-2020-fe299b3fa3vendor-advisory

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