CVE-2026-46338
PyMdown Extensions: Regression in pymdownx.snippets reintroduces sibling-prefix path traversal bypass despite restrict_base_path
Description
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.
INFO
Published Date :
July 16, 2026, 7:16 p.m.
Last Modified :
July 30, 2026, 2:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update PyMdown Extensions to version 10.21.3.
- Verify the restriction of base path access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46338.
| URL | Resource |
|---|---|
| https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c | Patch |
| https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3 | Product Release Notes |
| https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h | Exploit Mitigation Vendor Advisory |
| https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46338 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46338
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46338 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46338 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 30, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:facelessuser:pymdown_extensions:*:*:*:*:*:*:*:* versions from (including) 10.0.1 up to (excluding) 10.21.3 Added Reference Type GitHub, Inc.: https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 17, 2026
Action Type Old Value New Value Added Reference https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h Added SSVC {'id': 'CVE-2026-46338', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-17T17:52:47.052382Z'} -
New CVE Received by [email protected]
Jul. 16, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'facelessuser', 'product': 'pymdown-extensions', 'versions': [{'status': 'affected', 'version': '>= 10.0.1, < 10.21.3'}]}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Added CWE CWE-22 Added Reference https://github.com/facelessuser/pymdown-extensions/commit/63b7835776d703d6c339cf2110d9888f676efc0c Added Reference https://github.com/facelessuser/pymdown-extensions/releases/tag/10.21.3 Added Reference https://github.com/facelessuser/pymdown-extensions/security/advisories/GHSA-62q4-447f-wv8h