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CVE-2019-25781— Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing

Quick assessment

Affected
Python-Markdown Markdown
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.

Python-Markdown 3.0 至 3.11.2 版本在行内链接解析中存在算法复杂度漏洞。远程攻击者可利用未匹配的括号耗尽 CPU 资源。攻击者可以提交包含重复 或 字符的简短 Markdown 内容，迫使 和 方法执行二次方复杂度的扫描，导致工作进程持续繁忙数分钟。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Python-Markdown Markdown 3.0≤ 3.11.2 affected
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I. Basic Information for CVE-2019-25781

Vulnerability Information
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Vulnerability Title
Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.
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
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python-Markdown Markdown 3.0 ~ 3.11.2 -

II. Public POCs for CVE-2019-25781

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III. Intelligence Information for CVE-2019-25781

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Vendor Advisories for CVE-2019-25781 (1)

Vendor Pages for CVE-2019-25781 (1)

Other References for CVE-2019-25781 (2)

IV. Related Vulnerabilities

Same product: Markdown
Same weakness: CWE-407