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CVE-2026-49821— Fission: Cross-namespace Environment reference in Package allows build-time command execution and SA token exfiltration

CVSS 7.7 · High EPSS 0.23% · P14

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
fissionfission< 1.24.0affected
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I. Basic Information for CVE-2026-49821

Vulnerability Information
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Vulnerability Title
Fission: Cross-namespace Environment reference in Package allows build-time command execution and SA token exfiltration
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 1.24.0, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
未有动机的代理或中间人(混淆代理)
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 1.24.0之前版本存在安全漏洞，该漏洞源于buildermgr控制器处理Package CRD时未验证Package.spec.environment.namespace与Package.metadata.namespace是否匹配。
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 < 1.24.0 -

II. Public POCs for CVE-2026-49821

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 10462 chars
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III. Intelligence Information for CVE-2026-49821

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Patches & Fixes for CVE-2026-49821 (1)

Vendor Advisories for CVE-2026-49821 (1)

Vendor Pages for CVE-2026-49821 (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-2026-505708.5 HIGHFission: Incomplete capability denylist in Environment/Function PodSpec validation allows
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-2026-505677.7 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-441

V. Comments for CVE-2026-49821

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