CVE-2023-24824

HIGH7.5EPSS 0.32%

cmark-gfm: resource exhaustion due to quadratic complexity in parser

Published: 12/27/2025Modified: 4/28/2026

Also known as:GHSA-66g8-4hjf-77xhDEBIAN-CVE-2023-24824HSEC-2025-0007

Description

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of `>` or `-` characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources.

Affected packages (5)

Debian/cmark-gfmfrom 0
Debian/python-cmarkgfmfrom 0
Debian/r-cran-commonmarkfrom 0
Debian/ruby-commonmarkerfrom 0
Hackage/cmark-gfm>= 0.1.0, < 0.2.6

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (5)

ADVISORYhttps://github.com/github/cmark-gfm/security/advisories/GHSA-66g8-4hjf-77xh
ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2023-24824
ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2023-24824
PATCHhttps://github.com/github/cmark-gfm/commit/2300c1bd2c8226108885bf019655c4159cf26b59
PATCHhttps://github.com/kivikakk/cmark-gfm-hs/commit/1359b8740c6b29dde0ad8f816531112b32eb8cbe