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CVE-2022-39209— Uncontrolled Resource Consumption in cmark-gfm

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.6 之前版本存在资源管理错误漏洞，该漏洞源于自动链接扩展中的多项式时间复杂度问题，可能导致无限资源耗尽和后续的拒绝服务。

CVSS 7.5 · High EPSS 1.71% · P76

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-39209

Vulnerability Information
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Vulnerability Title
Uncontrolled Resource Consumption in cmark-gfm
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. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.6 之前版本存在资源管理错误漏洞，该漏洞源于自动链接扩展中的多项式时间复杂度问题，可能导致无限资源耗尽和后续的拒绝服务。
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

Vendor Product Affected Versions CPE Subscribe
github cmark-gfm < 0.29.0.gfm.6 -

II. Public POCs for CVE-2022-39209

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III. Intelligence Information for CVE-2022-39209

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Patches & Fixes for CVE-2022-39209 (1)

Vendor Advisories for CVE-2022-39209 (1)

Mailing List Discussions for CVE-2022-39209 (3)

Other References for CVE-2022-39209 (1)

IV. Related Vulnerabilities

Same product: cmark-gfm
Same vendor: github
Same weakness: CWE-400

V. Comments for CVE-2022-39209

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