CVE-2026-41205 HIGH

CVE-2026-41205: Mako: Path traversal via double-slash URI prefix in TemplateLookup

Vendor Sqlalchemy
Product mako
Weakness CWE-22 · Path traversal
Published April 23, 2026
Last update May 20, 2026
View on NVD All CVEs

CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 23, 2026 CVE published
May 20, 2026 Record updated