What’s Vulnerable › Vulnerabilities

CVE-2026-41205: Mako: Path traversal via double-slash URI prefix in TemplateLookup

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-23 · updated 2026-10-26
• Weakness: CWE-22

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.

Affected products

• sqlalchemy mako: before 1.3.11 — fixed in 1.3.11

How to fix

Upgrade to a fixed version: sqlalchemy mako 1.3.11. Check the vendor advisory for mitigations.

References

• https://github.com/sqlalchemy/mako/commit/e05ac61989a7fb9dd7dcde6cfd72dc48328719a3
• https://github.com/sqlalchemy/mako/releases/tag/rel_1_3_11
• https://github.com/sqlalchemy/mako/security/advisories/GHSA-v92g-xgxw-vvmm

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