TI-2026-37289 Aliases CVE-2026-50567 GHSA-q6vm-xqc9-v3ff

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

LOW 33CWE-22Published 2026-06-10 · Updated 2026-06-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00301 22nd percentileScored 2026-11-07

Fix Fixed fission (fission): 1.25.0github.com/fission/fission (Go): 1.25.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
fission	fission	before 1.25.0	1.25.0	Patch available	CNA
—	github.com/fission/fission (Go)	before 1.25.0	1.25.0	Patch available	GHSA-q6vm-xqc9-v3ff

fission Vendorfission Affected before 1.25.0 Fixed in 1.25.0 Patch available CNA
github.com/fission/fission (Go) Vendor— Affected before 1.25.0 Fixed in 1.25.0 Patch available GHSA-q6vm-xqc9-v3ff

Remediation

Fix · CNA fission (fission) Fixed in 1.25.0
Fix · GHSA-q6vm-xqc9-v3ff github.com/fission/fission (Go) Fixed in 1.25.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-50567
2026-10-03 Alias added: GHSA-q6vm-xqc9-v3ff

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-50567

Other 4

TI-2026-34271 Improper access control in fission CVSS 3.1CRITICAL 9.8
TI-2026-34273 Improper privilege management in fission CVSS 4.0HIGH 8.7
TI-2026-37288 Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation CVSS 3.1CRITICAL 9.9
TI-2026-37286 Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape CVSS 3.1CRITICAL 9.9
TI-2026-37285 Fission Container Executor Function PodSpec Injection Leading to Node Escape CVSS 3.1CRITICAL 9.9
TI-2026-37268 Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover CVSS 3.1CRITICAL 9.9

See all 16 →

Sources

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