SB2026051516 - Path traversal in pymdown-extensions

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2026-46338)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to path traversal in SnippetPreprocessor.get_snippet_path() in pymdownx.snippets when processing a markdown snippet directive. A remote attacker can supply a crafted snippet path that traverses to a sibling directory sharing the same base-path prefix to disclose sensitive information.

User interaction is required to process attacker-controlled markdown content, such as in a documentation build pipeline.

Remediation

Install update from vendor's website.

References

• https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h
• https://github.com/facelessuser/pymdown-extensions/pull/2039