high
7.5
CWE
407 400
Advisory Published
Updated

CVE-2022-39209: Uncontrolled Resource Consumption in cmark-gfm

First published: Thu Sep 15 2022(Updated: )

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.

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
cmark-gfm<0.29.0.gfm.6
Fedora=35
Fedora=36
Fedora=37
debian/cmark-gfm<=0.29.0.gfm.0-6
0.29.0.gfm.6-6
0.29.0.gfm.13-4
debian/ghostwriter<=1.8.1-2
2.1.6+ds-2
24.12.0+ds-1
24.12.2+ds-1
debian/python-cmarkgfm<=0.4.2-1<=0.8.0-3
debian/r-cran-commonmark<=1.7-2
1.8.1-1
1.9.2-2
debian/ruby-commonmarker<=0.21.0-1<=0.23.6-1<=0.23.10-1

Remedy

https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-39209?

    CVE-2022-39209 is a vulnerability in cmark-gfm, GitHub's fork of cmark, which could lead to unbounded resource exhaustion and denial of service.

  • What is the severity of CVE-2022-39209?

    The severity of CVE-2022-39209 is high with a severity score of 6.5.

  • How does CVE-2022-39209 affect cmark-gfm?

    CVE-2022-39209 affects cmark-gfm versions prior to 0.29.0.gfm.6 and may lead to unbounded resource exhaustion and subsequent denial of service.

  • How can I verify if my version of cmark-gfm is affected by CVE-2022-39209?

    You can verify if your version of cmark-gfm is affected by CVE-2022-39209 by checking the patch version. Versions prior to 0.29.0.gfm.6 are affected.

  • How can I fix CVE-2022-39209?

    To fix CVE-2022-39209, you should update cmark-gfm to version 0.29.0.gfm.6 or newer.

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