CVE-2023-22486— cmark-gfm Quadratic complexity bug in handle_close_bracket may lead to a denial of service
Quick assessment
Affected
github cmark-gfm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
cmark-gfm是CommonMark的 C 参考实现的扩展版本，是带有规范的 Markdown 语法的合理化版本。 cmark-gfm 0.29.0.gfm.7之前版本存在资源管理错误漏洞，该漏洞源于在handle_close_bract函数中包含一个多项式时间复杂度问题，可能会导致无限资源耗尽和随后的拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-22486
Vulnerability Information
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Vulnerability Title
cmark-gfm Quadratic complexity bug in handle_close_bracket may lead to a denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
cmark-gfm 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cmark-gfm是CommonMark的 C 参考实现的扩展版本，是带有规范的 Markdown 语法的合理化版本。 cmark-gfm 0.29.0.gfm.7之前版本存在资源管理错误漏洞，该漏洞源于在handle_close_bract函数中包含一个多项式时间复杂度问题，可能会导致无限资源耗尽和随后的拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2023-22486
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Vendor Advisories for CVE-2023-22486 (1)
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https://github.com/github/cmark-gfm/security/advisories/GHSA-r572-jvj2-3m8p x_refsource_CONFIRM
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V. Comments for CVE-2023-22486
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