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TI-2026-37287 Aliases CVE-2026-50565GHSA-8wcj-mfrc-jx5q

Fission builder pods auto-mount the fission-builder ServiceAccount token in the user-supplied builder container

Priority LOW 22CWE-250Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · None · None
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, Fission builder pods were created with ServiceAccountName: fission-builder and no AutomountServiceAccountToken: false, so the kubelet auto-mounted the service-account token into every container in the pod — including the user-supplied builder image. This issue has been patched in version 1.24.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00256 17th 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
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
fissionfissionbefore 1.24.01.24.0Patch availableCNA
—github.com/fission/fission (Go)before 1.24.01.24.0Patch availableGHSA-8wcj-mfrc-jx5q
  • 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-8wcj-mfrc-jx5q

Remediation

  • Fix · CNA fission (fission) Fixed in 1.24.0
  • Fix · GHSA-8wcj-mfrc-jx5q github.com/fission/fission (Go) Fixed in 1.24.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50565
  2. 2026-10-03 Alias added: GHSA-8wcj-mfrc-jx5q

References

Advisory 1

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-2026-37286 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

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