TI-2026-37286 Aliases CVE-2026-50564 GHSA-gx55-f84r-v3r7

Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape

MEDIUM 43CWE-269Published 2026-06-10 · Updated 2026-06-12

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation, Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-269 and CWE-284.

Summary

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 Environment CRD exposes spec.runtime.podSpec and spec.builder.podSpec, which are merged into the Kubernetes pod specs for runtime and builder pods. The merge logic propagated hostNetwork, hostPID, hostIPC, container privileged, and serviceAccountName from the user-supplied podspec with no filtering, and Environment.Validate performed no security-relevant checks on these fields. This issue has been patched in version 1.24.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00274 19th percentileScored 2026-11-07

Fix Fixed fission (fission): 1.24.0github.com/fission/fission (Go): 1.24.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

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 1.24.0	1.24.0	Patch available	CNA
—	github.com/fission/fission (Go)	before 1.24.0	1.24.0	Patch available	GHSA-gx55-f84r-v3r7

fission Vendorfission Affected before 1.24.0 Fixed in 1.24.0 Patch available CNA
github.com/fission/fission (Go) Vendor— Affected before 1.24.0 Fixed in 1.24.0 Patch available GHSA-gx55-f84r-v3r7

Remediation

Fix · CNA fission (fission) Fixed in 1.24.0
Fix · GHSA-gx55-f84r-v3r7 github.com/fission/fission (Go) Fixed in 1.24.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-50564
2026-10-03 Alias added: GHSA-gx55-f84r-v3r7

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-50564

Other 5

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-2026-37285 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
TI-2026-34270 Fission StorageSvc /v1/archive endpoint exposes unauthenticated CRUD over all function archives CVSS 3.1HIGH 8.8

See all 16 →

Sources

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