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.
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{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "cmark-gfm" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "cmark-gfm-dbgsym" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm-dev" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm-extensions-dev" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm-extensions0.29.0.gfm.3" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm-extensions0.29.0.gfm.3-dbgsym" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm0.29.0.gfm.3" }, { "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1", "binary_name": "libcmark-gfm0.29.0.gfm.3-dbgsym" } ] }