Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. \..\..\ secret.txt) bypasses the directory traversal check in Template.__init__ and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-2h4p-vjrc-8xpq Mako vulnerable to path traversal via backslash URI on Windows in TemplateLookup
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 13 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 13 May 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Sqlalchemy
Sqlalchemy mako
Vendors & Products Sqlalchemy
Sqlalchemy mako

Tue, 12 May 2026 22:15:00 +0000

Type Values Removed Values Added
Description Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. \..\..\ secret.txt) bypasses the directory traversal check in Template.__init__ and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.
Title Mako: Path traversal via backslash URI on Windows in TemplateLookup
Weaknesses CWE-22
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T15:00:13.642Z

Reserved: 2026-05-05T19:00:06.021Z

Link: CVE-2026-44307

cve-icon Vulnrichment

Updated: 2026-05-13T14:59:45.298Z

cve-icon NVD

Status : Deferred

Published: 2026-05-12T22:16:37.567

Modified: 2026-05-13T18:15:26.870

Link: CVE-2026-44307

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T23:45:25Z

Weaknesses