Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Github | Cmark-Gfm | < 0.29.0.gfm.6 |
| Fedoraproject | Fedora | 35 |
Related Weaknesses (CWE)
References
- https://en.wikipedia.org/wiki/Time_complexityThird Party Advisory
- https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8PatchThird Party Advisory
- https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7qThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://en.wikipedia.org/wiki/Time_complexityThird Party Advisory
- https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8PatchThird Party Advisory
- https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7qThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2022-39209?
CVE-2022-39209 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2022-39209?
CVE-2022-39209 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-39209?
Check the references section above for vendor advisories and patch information. Affected products include: Github Cmark-Gfm, Fedoraproject Fedora.