Path Traversal in Facelessuser Pymdown-Extensions
CVE-2026-46338
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.003 (23.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
Affected products
- Facelessuser Pymdown-extensions — versions >= 10.0.1, < 10.21.3
- Facelessuser Pymdown_extensions
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-46338?
- CVE-2026-46338 is a medium-severity vulnerability in Facelessuser Pymdown-Extensions, classified under Path Traversal. CVSS score: 4.3/10. Published 2026-07-16.
- How severe is CVE-2026-46338?
- Medium severity. CVSS v3 base score is 4.3 out of 10.