Fission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape_CVE-2026-50568

{
    "lastseen": "",
    "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.",
    "published": "2026-06-10T17:31:49.917Z",
    "modified": "2026-06-10T17:31:49.917Z",
    "type": "cve",
    "title": "Fission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape",
    "source": "GitHub_M",
    "references": "https://github.com/fission/fission/security/advisories/GHSA-r5jh-q2mw-gcx4\nhttps://github.com/fission/fission/pull/3445\nhttps://github.com/fission/fission/pull/3446\nhttps://github.com/fission/fission/releases/tag/v1.25.0",
    "id": "CVE-2026-50568",
    "bulletinFamily": "",
    "cwe": [
        "CWE-41"
    ],
    "cvelist": null,
    "sourceData": "fission fission < 1.25.0",
    "sourceHref": "",
    "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",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "fission",
    "version": "< 1.25.0",
    "vendor": "fission",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}