CVE-2026-46338

PyMdown Extensions (pymdownx.snippets) contains a regression that reintroduces a sibling-prefix path traversal when restrict_base_path is True. From 10.0.1 through 10.21.2, get_snippet_path uses a string-prefix check (filename.startswith(base)) that can read files from sibling paths sharing the s...

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

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.getsnippetpath in pymdownx/snippets.py when restrictbasepath: True, allowing markdown snippet directives t...