{"id":"CVE-2026-50568","aliases":["GHSA-r5jh-q2mw-gcx4","GO-2026-6130"],"url":"https://o3.security/vulnerability/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.","published":"2026-06-10T17:31:49.917Z","modified":"2026-09-09T18:26:45.195908565Z","cvss":{"score":3.6,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"},"epss":{"score":0.00115,"percentile":0.01725,"asOf":"2026-09-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/fission/fission","fixedVersion":"1.25.0"}],"fix":{"url":"https://github.com/fission/fission/pull/3445","label":"fission/fission#3445"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-09T18:26:45.195908565Z"}}