{"id":"CVE-2026-62999","summary":"Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)","details":"Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded parent-directory segments or encoded path separators in a template URL can match a configured trusted repository prefix before an HTTP server or Git transport decodes the path, allowing unsafe template features from a repository outside the trusted prefix to run after user interaction. This issue is fixed in version 9.17.0.","aliases":["GHSA-34mv-rjq9-5mch"],"modified":"2026-08-02T03:47:28.574880839Z","published":"2026-07-31T19:41:55.494Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-180","CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62999.json"},"references":[{"type":"WEB","url":"https://github.com/copier-org/copier/releases/tag/v9.17.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62999.json"},{"type":"ADVISORY","url":"https://github.com/copier-org/copier/security/advisories/GHSA-34mv-rjq9-5mch"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62999"},{"type":"FIX","url":"https://github.com/copier-org/copier/commit/7408f0d6287a7bf452715fd9f25dc54eaba3c295"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/copier-org/copier","events":[{"introduced":"d735c8beac8307c06d9c881714328b76711a4b4d"},{"fixed":"fa9ce15ad39e1eb3085eeed4adb7b16a25e643e6"},{"fixed":"7408f0d6287a7bf452715fd9f25dc54eaba3c295"},{"fixed":"02e1574b125bd6201b55c01aab23146489c89663"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"9.5.0"},{"fixed":"9.16.0"}]}}],"versions":["v9.16.0","v9.15.2","v9.15.1","v9.15.0","v9.14.3","v9.14.2","v9.14.1","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"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62999.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}