CVE-2026-50568

Description

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.

Source: NVD

References

• [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-50568
• [Other]https://github.com/fission/fission/pull/3445
• [Other]https://github.com/fission/fission/pull/3446
• [Other]https://github.com/fission/fission/releases/tag/v1.25.0
• [Other]https://github.com/fission/fission/security/advisories/GHSA-r5jh-q2mw-gcx4