CVE-2026-41205

Description

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.

PUBLISHED Reserved 2026-04-18 | Published 2026-04-23 | Updated 2026-04-23 | Assigner GitHub_M

Problem types

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

Product status

References

github.com/...y/mako/security/advisories/GHSA-v92g-xgxw-vvmm

cve.org (CVE-2026-41205)

nvd.nist.gov (CVE-2026-41205)

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