medium4.3
CVE-2026-46338
Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pymdown-extensions | >= 10.0.1, <= 10.21.2 | 10.21.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Facelessuser | Pymdown Extensions | from 10.0.1 before 10.21.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-62q4-447f-wv8h
- https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h
- https://github.com/facelessuser/pymdown-extensions/pull/2039
- https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c
- https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3