CVE-2023-22486: cmark-gfm Quadratic complexity bug in handle_close_bracket may lead to a denial of service
First published: Tue Jan 24 2023(Updated: )
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. Versions prior to 0.29.0.gfm.7 contain a polynomial time complexity issue in handle_close_bracket that may lead to unbounded resource exhaustion and subsequent denial of service. This vulnerability has been patched in 0.29.0.gfm.7.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| cmark-gfm | <0.29.0.gfm.7 | |
| debian/cmark-gfm | <=0.29.0.gfm.0-6<=0.29.0.gfm.6-6 | 0.29.0.gfm.13-4 |
| 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 |
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Reference Links
- https://github.com/github/cmark-gfm/security/advisories/GHSA-r572-jvj2-3m8p
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-22486
- https://nvd.nist.gov/vuln/detail/CVE-2023-22486
- https://launchpad.net/bugs/cve/CVE-2023-22486
- https://security-tracker.debian.org/tracker/CVE-2023-22486
- https://ubuntu.com/security/CVE-2023-22486
- https://github.com/github/cmark-gfm/commit/ece074cc3378f7a8dec0395f00123e9fa6981f7b
- https://github.com/theacodes/cmarkgfm/commit/acf473a51a9dc3a4fd6d6a4b30e4d80c94d91d4a
- https://github.com/r-lib/commonmark/commit/e7a1703cf293eaa898e6f0cf07d278cfb05590eb
Frequently Asked Questions
What is CVE-2023-22486?
CVE-2023-22486 is a vulnerability in cmark-gfm, a CommonMark parsing and rendering library and program in C, that can lead to unbounded resource exhaustion and subsequent denial of service.
What is the severity of CVE-2023-22486?
The severity of CVE-2023-22486 is high with a score of 7.5 out of 10.
How does CVE-2023-22486 affect cmark-gfm?
Versions prior to 0.29.0.gfm.7 of cmark-gfm are affected by CVE-2023-22486.
How can CVE-2023-22486 be exploited?
CVE-2023-22486 can be exploited by an attacker to exploit the polynomial time complexity issue in handle_close_bracket, causing unbounded resource exhaustion.
Is there a fix available for CVE-2023-22486?
Yes, upgrading to version 0.29.0.gfm.7 or later of cmark-gfm fixes the vulnerability.
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