TI-2026-37288 Aliases CVE-2026-50566 GHSA-m63v-2g9w-2w6v

Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation

MEDIUM 43CWE-250Published 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
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-250.

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, a tenant with environments.fission.io create/update RBAC can run privileged / allowPrivilegeEscalation / dangerous-capability containers in the Fission function or builder namespace, scheduled under the executor's high-privilege service account — enabling container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise. This issue has been patched in version 1.24.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0029 21st 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-m63v-2g9w-2w6v

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-m63v-2g9w-2w6v

Remediation

Fix · CNA fission (fission) Fixed in 1.24.0
Fix · GHSA-m63v-2g9w-2w6v github.com/fission/fission (Go) Fixed in 1.24.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-50566
2026-10-03 Alias added: GHSA-m63v-2g9w-2w6v

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-50566

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-2026-37286 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
TI-2026-34270 Fission StorageSvc /v1/archive endpoint exposes unauthenticated CRUD over all function archives CVSS 3.1HIGH 8.8

See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences