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CVE-2026-46618— Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables

Quick assessment

Affected
fission fission
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 1.23.0之前版本存在操作系统命令注入漏洞，该漏洞源于构建器将Environment.spec.builder.command直接传递给exec.Command，未验证可执行路径或参数，允许用户创建或更新Environment CRD时在构建器Pod上下文中执行任意代码。

AI Predicted 7.8 Difficulty: Easy EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1610 · Deploy Container

Affected Version Matrix 1

VendorProduct Version RangeStatus
fission fission < 1.23.0 affected
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I. Basic Information for CVE-2026-46618

Vulnerability Information
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Vulnerability Title
Fission builder accepts arbitrary buildcmd strings from Environment.spec.builder.command, allowing the builder pod to invoke arbitrary executables
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 1.23.0, before the round-1 security sweep, pkg/builder/builder.go passed Environment.spec.builder.command directly into exec.Command(...) after a strings.Fields split, with no validation of the executable path or its arguments. A user who could create or update Environment CRDs in a namespace observed by the buildermgr could thereby point the builder pod at any executable inside the builder image (e.g. /bin/sh -c '...') and execute arbitrary code in the builder pod context. This issue has been patched in version 1.23.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Fission 操作系统命令注入漏洞
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 1.23.0之前版本存在操作系统命令注入漏洞，该漏洞源于构建器将Environment.spec.builder.command直接传递给exec.Command，未验证可执行路径或参数，允许用户创建或更新Environment CRD时在构建器Pod上下文中执行任意代码。
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

Vendor Product Affected Versions CPE Subscribe
fission fission < 1.23.0 -

II. Public POCs for CVE-2026-46618

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III. Intelligence Information for CVE-2026-46618

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Patches & Fixes for CVE-2026-46618 (1)

Vendor Advisories for CVE-2026-46618 (1)

Vendor Pages for CVE-2026-46618 (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-2026-50566 9.9 CRITICAL Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows
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

IV. Related Vulnerabilities

Same product: fission
Same vendor: fission
Same weakness: CWE-78

V. Comments for CVE-2026-46618

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