CVE-2026-46338

MEDIUM 4.3

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

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	facelessuser
Product	pymdown-extensions
Published	Jul 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

facelessuser / pymdown-extensions

>= 10.0.1, < 10.21.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h github.com: https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c github.com: https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3