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Vulnerability · Published Mar 31, 2023 · Assigned by GitHub_M

CVE-2023-24824Quadratic complexity may lead to a denial of service in cmark-gfm

Medium 5.3

In plain English

A medium-severity uncontrolled resource consumption in cmark-gfm from github. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)1.0%top 36.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8pandoc2.0.6-7.el8_10ALSA-2025:8427
AlmaLinux:8pandoc-common2.0.6-7.el8_10ALSA-2025:8427
Debian:12cmark-gfmno fix listedDEBIAN-CVE-2023-24824
Debian:13cmark-gfm0.29.0.gfm.13-1DEBIAN-CVE-2023-24824
Debian:14cmark-gfm0.29.0.gfm.13-1DEBIAN-CVE-2023-24824
Debian:12python-cmarkgfmno fix listedDEBIAN-CVE-2023-24824
Debian:13python-cmarkgfm2024.11.20-1DEBIAN-CVE-2023-24824
Debian:14python-cmarkgfm2024.11.20-1DEBIAN-CVE-2023-24824
Debian:12r-cran-commonmarkno fix listedDEBIAN-CVE-2023-24824
Debian:13r-cran-commonmark1.9.1-1DEBIAN-CVE-2023-24824
Debian:14r-cran-commonmark1.9.1-1DEBIAN-CVE-2023-24824
Debian:12ruby-commonmarkerno fix listedDEBIAN-CVE-2023-24824
Debian:13ruby-commonmarker0.23.10-1DEBIAN-CVE-2023-24824
Debian:14ruby-commonmarker0.23.10-1DEBIAN-CVE-2023-24824
Rocky Linux:8pandoc0:2.0.6-7.el8_10RLSA-2025:8427
Ubuntu:22.04:LTScmarkno fix listedUBUNTU-CVE-2023-24824
Ubuntu:24.04:LTScmarkno fix listedUBUNTU-CVE-2023-24824
Ubuntu:25.10cmarkno fix listedUBUNTU-CVE-2023-24824
Ubuntu:26.04:LTScmarkno fix listedUBUNTU-CVE-2023-24824
Ubuntu:26.10cmarkno fix listedUBUNTU-CVE-2023-24824

Affected products (as reported)

VendorProductVersions
github cmark-gfm < 0.29.0.gfm.10

Weakness: CWE-400, CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References