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.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44307.json",
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-22"
]
}