{"id":"CVE-2026-34726","summary":"Copier `_subdirectory` allows template root escape via parent-directory traversal","details":"Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.","aliases":["GHSA-85v3-4m8g-hrh6"],"modified":"2026-07-08T08:12:53.622407714Z","published":"2026-04-02T18:07:35.517Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34726.json","cwe_ids":["CWE-22"],"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-2026-34726.json"},{"type":"ADVISORY","url":"https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34726"},{"type":"FIX","url":"https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/copier-org/copier","events":[{"introduced":"0"},{"fixed":"f6ac94689a0a672ae1a53d442740fb85dbd4004f"},{"fixed":"cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"9.14.1"}],"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-2026-34726.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:L/I:L/A:N"}]}