High severity · published Mar 31, 2023
CVE-2023-24824
Quadratic complexity may lead to a denial of service in cmark-gfm
7.5
CVSS
1%
EPSS
No
On KEV
Description
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 `>` or `-` 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cmark-gfm · github
< 0.29.0.gfm.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-24824
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-24824
Patch
https://github.com/github/cmark-gfm/commit/2300c1bd2c8226108885bf019655c4159cf26b59
Exploit
https://github.com/github/cmark-gfm/security/advisories/GHSA-66g8-4hjf-77xh
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