High severity · published May 12, 2026
CVE-2026-44307
Mako: Path traversal via backslash URI on Windows in TemplateLookup
8.7
CVSS
0.7%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
mako · sqlalchemy
< 1.3.12 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44307
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44307
github.com
https://github.com/sqlalchemy/mako/commit/72e10c573ca0fbcbddd4455abca8ce92a61780d7
github.com
https://github.com/sqlalchemy/mako/issues/435
github.com
https://github.com/sqlalchemy/mako/releases/tag/rel_1_3_12
github.com
https://github.com/sqlalchemy/mako/security/advisories/GHSA-2h4p-vjrc-8xpq
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