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    CVE-2026-34730

    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.

    Published:Apr 2, 2026
    Last Modified:Apr 7, 2026
    EPS:Apr 2, 2026
    EPSS Score:0.0001
    CVSS Score:5.5

    Affected Products

    Vendor
    Copier-org
    Product
    Copier

    Exploits

    https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4hhttps://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h

    Related CVEs

    CVE-2026-62999 (CVSS 7.5) — Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded pa…
    CVE-2026-53951 (CVSS 8.8) — Copier is a library and CLI app for rendering project templates. In versions 9.5.0 through 9.15.1, the `trust`…
    CVE-2026-34726 (CVSS 4.4) — Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirecto…
    CVE-2026-23986 (CVSS 6.9) — Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that…
    CVE-2026-23968 (CVSS 6.8) — Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that…
    CVE-2025-55214 (CVSS 6.9) — Copier library and CLI app for rendering project templates. From 7.1.0 to before 9.9.1, Copier suggests that i…
    CVE-2025-55201 (CVSS 8.5) — Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High