{"id":"CVE-2026-23968","aliases":["GHSA-xjhm-gp88-8pfx","PYSEC-2026-1274"],"url":"https://o3.security/vulnerability/CVE-2026-23968","summary":"Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false","details":"Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.","published":"2026-01-21T22:13:25.377Z","modified":"2026-08-07T11:49:51.607462850Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"copier","fixedVersion":"9.11.2"}],"fix":{"url":"https://github.com/copier-org/copier/commit/b3a7b3772d17cf0e7a4481978188c9f536c8d8f6","label":"copier-org/copier@b3a7b37"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23968.json"},{"type":"ADVISORY","url":"https://github.com/copier-org/copier/security/advisories/GHSA-xjhm-gp88-8pfx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23968"},{"type":"FIX","url":"https://github.com/copier-org/copier/commit/b3a7b3772d17cf0e7a4481978188c9f536c8d8f6"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:49:51.607462850Z"}}