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Untriaged
Permalink CVE-2026-34730
5.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): Required (R)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): None (N)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): Required (R)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): None (N)
created 1 month, 3 weeks ago Activity log
  • Created suggestion 1 month, 3 weeks ago
Copier `_external_data` allows path traversal and absolute-path local file read without unsafe mode

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.

Affected products

copier
  • ==< 9.14.1

Matching in nixpkgs

pkgs.copier

Library and command-line utility for rendering projects templates

pkgs.apksigcopier

Copy/extract/patch android apk signatures & compare APKs

pkgs.gnomeExtensions.copier

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  • nixos-unstable 8
    • nixpkgs-unstable 8
    • nixos-unstable-small 8
  • nixos-25.11 8
    • nixos-25.11-small 8
    • nixpkgs-25.11-darwin 8

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