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high7.5

CVE-2022-39209

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C.

Impact

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.

Affected products

VendorProductAffected versions
GithubCmark-Gfm
before 0.29.0.gfm.6
FedoraprojectFedora
Versions 35, 36, 37

Weakness classification

CWE-400CWE-407

References