{"id":"CVE-2026-50568","summary":"Fission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape","details":"Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, SanitizeFilePath in pkg/utils/utils.go validated that a path stayed under a safe directory by calling strings.HasPrefix(path, safedir). This is a lexical check, not a directory boundary check: /packages-extra/evil starts with /packages, so it passed. The function did not enforce a path-separator boundary, so any sibling directory whose name began with the safe-directory string was accepted. Callers included the builder's Clean handler (pkg/builder/builder.go:208) and the fetcher's Fetch / Upload handlers (pkg/fetcher/fetcher.go). A tenant who could pre-create or control a sibling directory under the fetcher / builder's shared volume could induce a write or read outside the intended safe directory. This issue has been patched in version 1.25.0.","aliases":["GHSA-r5jh-q2mw-gcx4"],"modified":"2026-07-15T01:49:03.822930838Z","published":"2026-06-10T17:31:49.917Z","database_specific":{"cwe_ids":["CWE-41"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50568.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/fission/fission/releases/tag/v1.25.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50568.json"},{"type":"ADVISORY","url":"https://github.com/fission/fission/security/advisories/GHSA-r5jh-q2mw-gcx4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50568"},{"type":"FIX","url":"https://github.com/fission/fission/pull/3445"},{"type":"FIX","url":"https://github.com/fission/fission/pull/3446"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fission/fission","events":[{"introduced":"0"},{"fixed":"ae970aaa9bc76ec93d748bdaf03fd7523b6b6a62"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.25.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.24.0","v1.23.0-rc1","v1.23.0","v1.22.0","v1.22.0-rc2","v1.22.0-rc1","v1.21.0","v1.21.0-rc2","v1.21.0-rc1","v1.20.5","v1.20.4","v1.20.3","v1.20.2","v1.20.1","v1.20.0","v1.20.0-rc2","v1.20.0-rc1","v1.19.0","v1.19.0-rc2","v1.19.0-rc1","v1.18.0","v1.18.0-rc2","v1.18.0-rc1","v1.17.0","v1.17.0-rc2","v1.16.0","v1.17.0-rc1","v1.16.0-rc2","v1.16.0-rc1","v1.15.1","v1.15.0","v1.15.0-rc2","v1.15.0-rc1","v1.14.1","1.14.1","v1.14.0","1.14.0","v1.13.1","1.13.1","v1.13.0","1.13.0","v1.8.0","1.8.0","v1.7.1","1.7.1","v1.7.0","1.7.0","v1.7.0-rc.2","1.7.0-rc.2","v1.7.0-rc.1","1.7.0-rc.1","v1.6.0","1.6.0","1.3.0","1.0-rc1","0.10.0","0.7.2","0.6.1","latest","0.6.0","0.4.1","0.4.0","0.4.0rc","0.3.0","0.3.0-rc","v0.2.1","v0.2.0-20170901","nightly20170705","nightly20170621","alpha20170124","kubecon"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50568.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}