Fission: Cross-namespace Package read via unvalidated PackageRef in Function admission webhook
CVE-2026-49823

7.7HIGH

Key Information:

Vendor

Fission

Status
Fission
Vendor
CVE Published:
10 June 2026

What is CVE-2026-49823?

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 Fission Function spec carries three reference types — Secret, ConfigMap, and Package. The first two were namespace-validated by the admission webhook; PackageRef.Namespace was not. This issue has been patched in version 1.24.0.

Affected Version(s)

fission < 1.24.0

References

https://github.com/fission/fission/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/fission/fission/pull/3389
x_refsource_MISC
https://github.com/fission/fission/releases/tag/v1.24.0
x_refsource_MISC

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.