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CVE-2026-34730

CVE-2026-34730 · Copier `_external_data` allows path traversal and absolute-path local file read without unsafe mode

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

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This issue has been patched in version 9.14.1.

CVSS 5.5 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • copier

    Versions
    • < 9.14.1: Affected

    No fix published

  • copier PyPI

    Versions
    • 2.0.0
    • 2.0.1
    • 2.1.0
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.3
    • 2.3.1
    • 2.3.2
    • 2.3.3
    • 2.4.0
    • 2.4.1
    • 2.4.2
    • 2.5.0
    • 2.5.1
    • 3.0.0a3
    • 3.0.0a5
    • 3.0.0a6
    • 3.0.0a7
    • 3.0.0a8
    • 3.0.0b1
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.0.4
    • 3.0.5
    • 3.0.6
    • 3.1.0
    • 3.2.0
    • 4.0.0
    • 4.0.1
    • 4.0.2
    • 4.1.0
    • 5.0.0
    • 5.1.0
    • 6.0.0
    • 6.0.0a0
    • 6.0.0a2
    • 6.0.0a3
    • 6.0.0a4
    • 6.0.0a5
    • 6.0.0a6
    • 6.0.0a7
    • 6.0.0a9
    • 6.0.0b0
    • 6.1.0
    • 6.2.0
    • 7.0.1
    • 7.1.0
    • 7.1.0a0
    • 7.2.0
    • 8.0.0
    • 8.1.0
    • 8.2.0
    • 8.3.0
    • 9.0.1
    • 9.1.0
    • 9.1.1
    • 9.10.0
    • 9.10.1
    • 9.10.2
    • 9.10.3
    • 9.11.0
    • 9.11.1
    • 9.11.2
    • 9.11.3
    • 9.12.0
    • 9.13.0
    • 9.13.1
    • 9.14.0
    • 9.2.0
    • 9.3.0
    • 9.3.1
    • 9.4.0
    • 9.4.1
    • 9.5.0
    • 9.6.0
    • 9.7.0
    • 9.7.1
    • 9.8.0
    • 9.9.0
    • 9.9.1
    Affected ranges
    • ECOSYSTEM: < 9.14.1

    Update to 9.14.1

Original sources

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