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

CVSS 8.5 · High EPSS 0.27% · P19

Affected Version Matrix 1

VendorProductVersion RangeStatus
fissionfission< 1.25.0affected
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I. Basic Information for CVE-2026-50570

Vulnerability Information
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Vulnerability Title
Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权管理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Fission 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fission是Fission开源的一个基于Kubernetes的函数部署框架。 Fission 1.25.0之前版本存在安全漏洞，该漏洞源于PodSpec安全验证中能力检查的黑名单遗漏了CAP_SYS_TIME，导致租户可以请求该能力并运行攻击者控制的代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
fissionfission < 1.25.0 -

II. Public POCs for CVE-2026-50570

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8586 chars
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III. Intelligence Information for CVE-2026-50570

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Patches & Fixes for CVE-2026-50570 (1)

Vendor Advisories for CVE-2026-50570 (1)

Same Patch Batch · fission · 2026-06-10 · 17 CVEs total

CVE-2026-505639.9 CRITICALFission Container Executor Function PodSpec Injection Leading to Node Escape
CVE-2026-505669.9 CRITICALFission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows
CVE-2026-505459.9 CRITICALFission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover
CVE-2026-505649.9 CRITICALFission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, n
CVE-2026-466149.8 CRITICALFission router exposes /fission-function/<ns>/<name> on its public listener, allowing invo
CVE-2026-466128.8 HIGHFission StorageSvc /v1/archive endpoint exposes unauthenticated CRUD over all function arc
CVE-2026-498248.5 HIGHFission: Cross-namespace Environment reference via unvalidated EnvironmentRef in Function
CVE-2026-498237.7 HIGHFission: Cross-namespace Package read via unvalidated PackageRef in Function admission web
CVE-2026-498227.7 HIGHFission: Cross-namespace event leakage via KubernetesWatchTrigger allows persistent tenant
CVE-2026-498217.7 HIGHFission: Cross-namespace Environment reference in Package allows build-time command execut
CVE-2026-505677.7 HIGHFission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destin
CVE-2026-505654.9 MEDIUMFission builder pods auto-mount the fission-builder ServiceAccount token in the user-suppl
CVE-2026-505694.3 MEDIUMFission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypass
CVE-2026-505683.6 LOWFission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape
CVE-2026-46617Fission runtime pods automount the fission-fetcher service-account token into the user fun
CVE-2026-46618Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command,

IV. Related Vulnerabilities

Same product: fission
Same vendor: fission
Same weakness: CWE-269

V. Comments for CVE-2026-50570

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