sqlalchemy mako up to 1.3.10 TemplateLookup.get_template path traversal

Summaryinfo

A vulnerability marked as critical has been reported in sqlalchemy mako up to 1.3.10. Affected by this issue is the function TemplateLookup.get_template. The manipulation leads to path traversal. This vulnerability is referenced as CVE-2026-41205. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in sqlalchemy mako up to 1.3.10 and classified as critical. This issue affects the function TemplateLookup.get_template. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. The summary by CVE is:

Mako is a template library written in Python. Prior to 1.3.11, TemplateLookup.get_template() is vulnerable to path traversal when a URI starts with // (e.g., //../../../secret.txt). The root cause is an inconsistency between two slash-stripping implementations. Any file readable by the process can be returned as rendered template content when an application passes untrusted input directly to TemplateLookup.get_template(). This vulnerability is fixed in 1.3.11.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-41205 since 04/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 310039 (Linux Distros Unpatched Vulnerability : CVE-2026-41205), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.3.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (310039). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• sqlalchemy

Name

• mako

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6
• 1.3.7
• 1.3.8
• 1.3.9
• 1.3.10

Website

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

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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