CVE-2026-46338
PyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path
MEDIUM 4.3EPSS 0.4%
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.
- Affected
- facelessuser · pymdown-extensions
- CVSS v3.1 GITHUB
- 4.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N - EPSS
- 0.40% chance of exploitation in the next 30 days, 33rd percentile
- Published
- 2026-07-16
- Updated
- 2026-07-17
Proof-of-concept exploits (1)
Security advisories
- facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h
- facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c