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CVE-2026-46338— PyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path

CVSS 4.3 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProductVersion RangeStatus
facelessuserpymdown-extensions>= 10.0.1, < 10.21.3affected
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I. Basic Information for CVE-2026-46338

Vulnerability Information
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Vulnerability Title
PyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path
Source: CVE Program / CVE List V5
Vulnerability Description
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. From 10.0.1 until 10.21.3, pymdownx.snippets uses a string-prefix containment check in SnippetPreprocessor.get_snippet_path() in pymdownx/snippets.py when `restrict_base_path: True`, allowing markdown snippet directives to read files from sibling paths that share the same base_path prefix, such as docs and docs_internal. This is a regression of CVE-2023-32309. This issue is fixed in version 10.21.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
facelessuser PyMdown Extensions 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
facelessuser PyMdown Extensions是facelessuser个人开发者开源的一个PythonMarkdown扩展集合。 facelessuser PyMdown Extensions 10.0.1版本至10.21.3之前版本存在路径遍历漏洞，该漏洞源于在SnippetPreprocessor.get_snippet_path()中使用字符串前缀包含检查，允许markdown片段指令读取共享相同base_path前缀的兄弟路径中的文件，如docs和docs_internal，容易
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

VendorProductAffected VersionsCPESubscribe
facelessuserpymdown-extensions >= 10.0.1, < 10.21.3 -

II. Public POCs for CVE-2026-46338

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III. Intelligence Information for CVE-2026-46338

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Patches & Fixes for CVE-2026-46338 (2)

Vendor Advisories for CVE-2026-46338 (1)

IV. Related Vulnerabilities

Same product: pymdown-extensions
Same vendor: facelessuser
Same weakness: CWE-22

V. Comments for CVE-2026-46338

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