CVE-2026-44307 PUBLISHED

Mako: Path traversal via backslash URI on Windows in TemplateLookup

Assigner: GitHub_M
Reserved: 05.05.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Metrics

CVSS 4.0

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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	sqlalchemy
Product	mako
Versions	Version < 1.3.12 is affected

References

Problem Types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE