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CVE-2026-41205

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.7 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • mako

    Versions
    • < 1.3.11: Affected

    No fix published

  • mako Debian:12

    Versions
    • 1.2.4+ds-1
    • 1.2.4+ds-2
    • 1.3.1-1
    • 1.3.10-1
    • 1.3.10-2
    • 1.3.10-3
    • 1.3.2-1
    • 1.3.5-1
    • 1.3.5-1.1
    • 1.3.6-1
    • 1.3.8-1
    • 1.3.8-2
    • 1.3.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mako Debian:13

    Versions
    • 1.3.10-1
    • 1.3.10-2
    • 1.3.10-3
    • 1.3.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mako Debian:14

    Versions
    • 1.3.10-1
    • 1.3.10-2
    • 1.3.10-3
    • 1.3.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mako PyPI

    Versions
    • 0.1.0
    • 0.1.1
    • 0.1.10
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.3.0
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.3.5
    • 0.3.6
    • 0.4.0
    • 0.4.1
    • 0.4.2
    • 0.5.0
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.7.0
    • 0.7.1
    • 0.7.2
    • 0.7.3
    • 0.8.0
    • 0.8.1
    • 0.9.0
    • 0.9.1
    • 1.0.0
    • 1.0.1
    • 1.0.10
    • 1.0.11
    • 1.0.12
    • 1.0.13
    • 1.0.14
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.0.8
    • 1.0.9
    • 1.1.0
    • 1.1.1
    • 1.1.2
    • 1.1.3
    • 1.1.4
    • 1.1.5
    • 1.1.6
    • 1.2.0
    • 1.2.1
    • 1.2.2
    • 1.2.3
    • 1.2.4
    • 1.3.0
    • 1.3.1
    • 1.3.10
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.3.5
    • 1.3.6
    • 1.3.7
    • 1.3.8
    • 1.3.9
    Affected ranges
    • ECOSYSTEM: < 1.3.11

    Update to 1.3.11

  • mako Ubuntu:Pro:16.04:LTS

    Versions
    • 1.0.2+ds1-1
    • 1.0.3+ds1-1
    • 1.0.3+ds1-1ubuntu1
    • 1.0.3+ds1-1ubuntu1+esm1
    Affected ranges
    • ECOSYSTEM: < 1.0.3+ds1-1ubuntu1+esm2

    Update to 1.0.3+ds1-1ubuntu1+esm2

  • mako Ubuntu:Pro:18.04:LTS

    Versions
    • 1.0.7+ds1-1
    • 1.0.7+ds1-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 1.0.7+ds1-1ubuntu0.2+esm1

    Update to 1.0.7+ds1-1ubuntu0.2+esm1

  • mako Ubuntu:Pro:20.04:LTS

    Versions
    • 1.0.7+ds1-1
    • 1.1.0+ds1-1
    • 1.1.0+ds1-1ubuntu1
    • 1.1.0+ds1-1ubuntu2
    • 1.1.0+ds1-1ubuntu2.1
    Affected ranges
    • ECOSYSTEM: < 1.1.0+ds1-1ubuntu2.1+esm1

    Update to 1.1.0+ds1-1ubuntu2.1+esm1

  • mako Ubuntu:22.04:LTS

    Versions
    • 1.1.3+ds1-2
    • 1.1.3+ds1-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 1.1.3+ds1-2ubuntu0.2

    Update to 1.1.3+ds1-2ubuntu0.2

  • mako Ubuntu:24.04:LTS

    Versions
    • 1.2.4+ds-2
    • 1.3.1-1
    • 1.3.2-1
    Affected ranges
    • ECOSYSTEM: < 1.3.2-1ubuntu0.1

    Update to 1.3.2-1ubuntu0.1

  • mako Ubuntu:25.10

    Versions
    • 1.3.8-2
    • 1.3.9-1
    Affected ranges
    • ECOSYSTEM: < 1.3.9-1ubuntu0.1

    Update to 1.3.9-1ubuntu0.1

  • mako Ubuntu:26.04:LTS

    Versions
    • 1.3.9-1
    • 1.3.10-3
    • 1.3.10-3build1
    Affected ranges
    • ECOSYSTEM: < 1.3.10-3ubuntu0.1

    Update to 1.3.10-3ubuntu0.1

Original sources

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