漏洞信息
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Vulnerability Title
pymdown-extensions: Exponential-backtracking ReDoS in caret, tilde, betterem, and magiclink inline processors
Vulnerability Description
pymdown-extensions is a collection of extensions for the Python Markdown library. In versions up to and including 11.0, four inline processors (caret, tilde, betterem, and magiclink) use regular expressions whose content groups can partition a run of delimiter characters in exponentially many ways, causing catastrophic backtracking. As a result, a single untrusted Markdown line under 50 bytes rendered with markdown.markdown() in each extension's default configuration drives the rendering thread into unbounded CPU usage that grows exponentially with input length, enabling an unauthenticated remote attacker who can submit Markdown to cause denial of service. The exposure is concrete for web applications that render user-supplied Markdown (comments, wikis, issue bodies, live preview), including any app using pymdownx.extra which bundles the vulnerable betterem default, as well as hosted docs/CI systems that build untrusted Markdown. The issue has been fixed in version 11.0.1.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
CWE-1333
Vulnerability Title
Isaac Muse PyMdown Extensions 资源管理错误漏洞
Vulnerability Description
facelessuser PyMdown Extensions是facelessuser个人开发者开源的一个PythonMarkdown扩展集合。 Isaac Muse PyMdown Extensions 11.0及之前版本存在资源管理错误漏洞,该漏洞源于caret、tilde、betterem和magiclink内联处理器使用正则表达式时存在灾难性回溯问题,可能导致未经身份验证的远程攻击者通过提交Markdown内容造成拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A