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CVE-2026-50567— Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory

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 1.25.0之前版本存在路径遍历漏洞，该漏洞源于Unarchive函数使用filepath.Join连接归档条目名称与目标目录后未检查解析路径是否在目标目录下，攻击者可通过控制Package.Spec.Source.URL或Deployment.URL归档诱导fetcher写入任意位置。

CVSS 7.7 · High EPSS 0.45% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
fission fission < 1.25.0 affected
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I. Basic Information for CVE-2026-50567

Vulnerability Information
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Vulnerability Title
Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory
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 1.25.0, Unarchive in pkg/utils/zip.go joined each archive entry name with the destination directory via filepath.Join and wrote the result without checking whether the resolved path stayed under the destination. A zip entry named ../../tmp/evil therefore landed at /tmp/evil. An attacker who could control a Package.Spec.Source.URL or Deployment.URL archive could induce the fetcher (running as the per-environment pod's fission-fetcher sidecar) to write files anywhere that process could reach: into other tenants' /packages/<ns>/ directories, into mounted secret/config volumes, or into the fetcher's own binary. This issue has been patched in version 1.25.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fission 路径遍历漏洞
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之前版本存在路径遍历漏洞，该漏洞源于Unarchive函数使用filepath.Join连接归档条目名称与目标目录后未检查解析路径是否在目标目录下，攻击者可通过控制Package.Spec.Source.URL或Deployment.URL归档诱导fetcher写入任意位置。
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 < 1.25.0 -

II. Public POCs for CVE-2026-50567

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Qwen3.6-35B-A3B · 10056 chars
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III. Intelligence Information for CVE-2026-50567

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Patches & Fixes for CVE-2026-50567 (1)

Vendor Advisories for CVE-2026-50567 (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-2026-50565 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-22

V. Comments for CVE-2026-50567

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