CVE-2022-39209

 

Published at: - 15-09-2022 08:15

Last modified: - 20-01-2023 01:34

Total changes: - 8

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q
• https://en.wikipedia.org/wiki/Time_complexity
• https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655
• FEDORA-2022-f1aed93db8-Mailing List, Third Party Advisory
• FEDORA-2022-6bcee2cc93-Mailing List, Third Party Advisory
• FEDORA-2022-dc6d6d9d6c-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2022-39209

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures