CVE-2026-46338
MEDIUMPyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h
X_Refsource_Misc x_refsource_misc
https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c
X_Refsource_Misc x_refsource_misc
https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3
Scores
CVSS v3
4.3
EPSS
0.0031
EPSS Percentile
23.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-22
Status
published
Products (2)
facelessuser/pymdown-extensions
>= 10.0.1, < 10.21.3
facelessuser/pymdown_extensions
10.0.1 - 10.21.3
Published
Jul 16, 2026
Tracked Since
Jul 17, 2026