CVE-2026-61632

CVE-2026-61632 affects PyMdown Extensions (b64 extension) up to version 10.21.3. The b64 code path in pymdownx/b64.py joins the attacker-controlled image src onto a configured base_path (or uses an absolute path) and opens the result without ensuring the resolved path stays inside base_path, allo...

PyMdown Extensions: Path traversal in the b64 extension lets <img src> read files outside base_path

SummaryThe b64 extension inlines images referenced by as base64 data URIs. When resolving the src path it joins it onto the configured basepath with os.path.normpath and opens the result directly, with no check that the resolved path stays inside basepath. A src containing ../ sequences, or an...