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CVE-2026-50566— Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation

Quick assessment

Affected
fission fission
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fission是Fission开源的一个基于Kubernetes的函数部署框架。 Fission 1.24.0之前版本存在安全漏洞，该漏洞源于具有environments.fission.io create/update RBAC权限的租户可运行特权/允许特权升级/危险能力容器，在Fission函数或构建器命名空间中，在执行器高权限服务账户下调度，导致容器沙箱逃逸、主机文件系统和网络访问以及节点和集群级破解。

CVSS 9.9 · Critical EPSS 0.51% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
fission fission < 1.24.0 affected
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I. Basic Information for CVE-2026-50566

Vulnerability Information
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Vulnerability Title
Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation
Source: CVE Program / CVE List V5
Vulnerability Description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, a tenant with environments.fission.io create/update RBAC can run privileged / allowPrivilegeEscalation / dangerous-capability containers in the Fission function or builder namespace, scheduled under the executor's high-privilege service account — enabling container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise. This issue has been patched in version 1.24.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
带着不必要的权限执行
Source: CVE Program / CVE List V5
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 1.24.0之前版本存在安全漏洞，该漏洞源于具有environments.fission.io create/update RBAC权限的租户可运行特权/允许特权升级/危险能力容器，在Fission函数或构建器命名空间中，在执行器高权限服务账户下调度，导致容器沙箱逃逸、主机文件系统和网络访问以及节点和集群级破解。
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

Vendor Product Affected Versions CPE Subscribe
fission fission < 1.24.0 -

II. Public POCs for CVE-2026-50566

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10787 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-50566

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Patches & Fixes for CVE-2026-50566 (1)

Vendor Advisories for CVE-2026-50566 (1)

Vendor Pages for CVE-2026-50566 (1)

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

CVE-2026-50563 9.9 CRITICAL Fission Container Executor Function PodSpec Injection Leading to Node Escape
CVE-2026-50545 9.9 CRITICAL Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover
CVE-2026-50564 9.9 CRITICAL Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, n
CVE-2026-46614 9.8 CRITICAL Fission router exposes /fission-function/<ns>/<name> on its public listener, allowing invo
CVE-2026-46612 8.8 HIGH Fission StorageSvc /v1/archive endpoint exposes unauthenticated CRUD over all function arc
CVE-2026-49824 8.5 HIGH Fission: Cross-namespace Environment reference via unvalidated EnvironmentRef in Function
CVE-2026-50570 8.5 HIGH Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows
CVE-2026-49823 7.7 HIGH Fission: Cross-namespace Package read via unvalidated PackageRef in Function admission web
CVE-2026-49822 7.7 HIGH Fission: Cross-namespace event leakage via KubernetesWatchTrigger allows persistent tenant
CVE-2026-49821 7.7 HIGH Fission: Cross-namespace Environment reference in Package allows build-time command execut
CVE-2026-50567 7.7 HIGH Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destin
CVE-2026-50565 4.9 MEDIUM Fission builder pods auto-mount the fission-builder ServiceAccount token in the user-suppl
CVE-2026-50569 4.3 MEDIUM Fission: HTTPTrigger admission omits RelativeURL / Prefix validation; kubectl apply bypass
CVE-2026-50568 3.6 LOW Fission: SanitizeFilePath lexical HasPrefix bypass permits sibling-directory escape
CVE-2026-46617 Fission runtime pods automount the fission-fetcher service-account token into the user fun
CVE-2026-46618 Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command,

IV. Related Vulnerabilities

Same product: fission
Same vendor: fission
Same weakness: CWE-250

V. Comments for CVE-2026-50566

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