{"id":"CVE-2026-34730","summary":"Copier `_external_data` allows path traversal and absolute-path local file read without unsafe mode","details":"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.","aliases":["GHSA-hgjq-p8cr-gg4h","PYSEC-2026-2135"],"modified":"2026-07-13T07:26:23.004695012Z","published":"2026-04-02T18:09:16.007Z","database_specific":{"cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34730.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/copier-org/copier/releases/tag/v9.14.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34730.json"},{"type":"ADVISORY","url":"https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34730"},{"type":"FIX","url":"https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641b"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/copier-org/copier","events":[{"introduced":"0"},{"fixed":"f6ac94689a0a672ae1a53d442740fb85dbd4004f"},{"fixed":"5413062eb17b73dc885f5e645cdc161e69ef641b"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"9.14.1"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:copier-org:copier:*:*:*:*:*:python:*:*"}}],"versions":["v9.14.0","v9.13.1","v9.13.0","v9.12.0","v9.11.3","v9.11.2","v9.11.1","v9.11.0","v9.10.3","v9.10.2","v9.10.1","v9.10.0","v9.9.1","v9.9.0","v9.8.0","v9.7.1","v9.7.0","v9.6.0","v9.5.0","v9.4.1","v9.4.0","v9.3.1","v9.3.0","v9.2.0","v9.1.1","v9.0.1","v9.0.0","v8.3.0","v8.2.0","v8.1.0","v8.0.0","v7.2.0","v7.1.0","v7.1.0a0","v7.0.1","v6.2.0","v6.1.0","v6.0.0","v6.0.0b0","v6.0.0a9","v6.0.0a8","v6.0.0a7","v6.0.0a6","v6.0.0a5","v6.0.0a4","v6.0.0a3","v6.0.0a2","v6.0.0a1","v6.0.0a0","v5.1.0","v5.0.0","v4.1.0","v4.0.2","v4.0.1","v4.0.0","v3.2.0","v3.1.0","v3.0.6","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v3.0.0-beta1","v3.0.0-alpha8","v3.0.0-alpha7","3.0.0-alpha6","3.0.0-alpha5","v3.0.0-alpha4","v3.0.0-alpha3","v3.0.0-alpha2","v3.0.0-alpha1","v2.5.1","v2.5.0","v2.4.2","v2.4.1","v2.4.0","v2.3.3","v2.3.2","v2.3.1","v2.3","v2.2.3","1.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34730.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}