Safety vulnerability ID: 54814
The information on this page was manually curated by our Cybersecurity Intelligence Team.
Pycmarkgfm 1.2.0 and prior versions rely on 'cmark-gfm' v0.29.0.gfm.6, which is vulnerable to a polynomial time complexity issue.
https://github.com/zopieux/pycmarkgfm/blob/2c31829e37b9d9be26d442e4a3cc0bbcdc9670a8/generated/cmark-gfm_version.h#L5
Latest version: 1.2.1
Bindings to GitHub's Flavored Markdown (cmark-gfm), with enhanced support for task lists.
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of `_` characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources. ### Impact A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. ### Proof of concept ``` $ ~/cmark-gfm$ python3 -c 'pad = "_" * 100000; print(pad + "." + pad, end="")' | time ./build/src/cmark-gfm --to plaintext ``` Increasing the number 10000 in the above commands causes the running time to increase quadratically. ### Patches This vulnerability have been patched in 0.29.0.gfm.10. ### Note on cmark and cmark-gfm XXX: TBD [cmark-gfm](https://github.com/github/cmark-gfm) is a fork of [cmark](https://github.com/commonmark/cmark) that adds the GitHub Flavored Markdown extensions. The two codebases have diverged over time, but share a common core. These bugs affect both `cmark` and `cmark-gfm`. ### Credit We would like to thank @gravypod for reporting this vulnerability. ### References https://en.wikipedia.org/wiki/Time_complexity ### For more information If you have any questions or comments about this advisory: * Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm) See CVE-2023-26485.
MISC:https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987: https://github.com/github/cmark-gfm/commit/07a66c9bc341f902878e37d7da8647d6ef150987
MISC:https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5: https://github.com/github/cmark-gfm/security/advisories/GHSA-r8vr-c48j-fcc5
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