SQLAlchemy Mako up to 1.4.1 Template Lookup mako/lookup.py TemplateLookup.get_template path traversal

Summaryinfo

A vulnerability was found in SQLAlchemy Mako up to 1.4.1. It has been declared as critical. Impacted is the function TemplateLookup.get_template of the file mako/lookup.py of the component Template Lookup. The manipulation results in path traversal. This vulnerability is reported as CVE-2026-102991. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in SQLAlchemy Mako up to 1.4.1. Affected is the function TemplateLookup.get_template of the file mako/lookup.py of the component Template Lookup. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Mako is a template library written in Python. Prior to 1.4.2, on Windows, TemplateLookup.get_template() in mako/lookup.py resolves template URIs with posixpath, while Template.__init__() in mako/template.py validates them with os.path, which uses ntpath. A URI beginning with a drive designator causes ntpath to absorb the traversal segments before the leading dot-dot check, while posixpath resolution can escape the configured template directory. An application that passes attacker-controlled template names or include paths can disclose process-readable files on the same volume, and a targeted file containing Mako template syntax may also be parsed and executed as a template. Raw URL paths are generally normalized before reaching this form, but query strings, form or JSON bodies, route parameters, and dynamic include expressions can preserve it. This issue is fixed in version 1.4.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-102991 since 09/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.4.2 eliminates this vulnerability.

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Productinfo

Vendor

• SQLAlchemy

Name

• Mako

Version

• 1.4.0
• 1.4.1

Website

• Product: https://github.com/sqlalchemy/mako/

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