CVE-2026-44307

Mako: Path traversal via backslash URI on Windows in TemplateLookup

CVSS 8.7 HIGHEPSS 0.6%CWE-22

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

12 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

sqlalchemy · mako

References

https://github.com/sqlalchemy/mako/commit/72e10c573ca0fbcbddd4455abca8ce92a61780d7 https://github.com/sqlalchemy/mako/issues/435 https://github.com/sqlalchemy/mako/releases/tag/rel_1_3_12 https://github.com/sqlalchemy/mako/security/advisories/GHSA-2h4p-vjrc-8xpq