CVE-2022-39209
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.
How to fix
- github cmark-gfm0.29.0.gfm.6 or later
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMGP65NANDVKPDMXMKYO2ZV2H2HZJY4P/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIUCZN3PEKUCT2JQYQTYOVIJG2KSD6G7/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEAAAI4OULDYQ2TA3HOXH54PC3DCBFZS/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github cmark-gfm | v < 0.29.0.gfm.6 | 0.29.0.gfm.6 |
| fedoraproject fedora | 35, 36, 37 | — |
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