CVE-2026-49822: Fission: Cross-namespace event leakage via KubernetesWatchTrigger allows persistent tenant surveillance

Severity: high (CVSS 7.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-10 · updated 2026-06-17
Weakness: CWE-284

Description

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 low-privilege developer who could create a KubernetesWatchTrigger (KWT) in their own namespace was able to establish a persistent surveillance channel over any other namespace. This issue has been patched in version 1.24.0.

Affected products

fission: before 1.24.0

References

https://github.com/fission/fission/pull/3379
https://github.com/fission/fission/releases/tag/v1.24.0
https://github.com/fission/fission/security/advisories/GHSA-gc3j-79f2-7vvw

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