Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption_CVE-2026-50570

{
    "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, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted CAP_SYS_TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: [\"SYS_TIME\"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP_SYS_TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.",
    "published": "2026-06-10T17:34:14.910Z",
    "modified": "2026-06-10T18:37:36.661Z",
    "type": "cve",
    "title": "Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption",
    "source": "GitHub_M",
    "references": "https://github.com/fission/fission/security/advisories/GHSA-qf5v-m7p4-95rp\nhttps://github.com/fission/fission/pull/3465\nhttps://github.com/fission/fission/releases/tag/v1.25.0",
    "id": "CVE-2026-50570",
    "bulletinFamily": "",
    "cwe": [
        "CWE-269",
        "CWE-732"
    ],
    "cvelist": null,
    "sourceData": "fission fission < 1.25.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L",
        "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": "Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption",
    "ai_severity": "High",
    "ai_vendor": "Fission",
    "ai_product": "Fission",
    "ai_version": "< 1.25.0",
    "ai_score": 8.5
}