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PatchSiren cyber security CVE debrief

CVE-2026-50566 fission CVE debrief

CVE-2026-50566 is a critical vulnerability in Fission, a Kubernetes-native serverless framework. 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. This enables container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise.

Vendor
fission
Product
Unknown
CVSS
CRITICAL 9.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-12
Advisory published
2026-06-10
Advisory updated
2026-06-12

Who should care

Users of Fission, a Kubernetes-native serverless framework, should be aware of this critical vulnerability. Specifically, tenants with environments.fission.io create/update RBAC are at risk.

Technical summary

The vulnerability has a CVSS score of 9.9 and is classified as CRITICAL. It was published on [cvePublishedAt] and modified on [cveModifiedAt]. The vulnerability is associated with CWE-250 and CWE-269.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Fission version 1.24.0 or later.
  • Review and restrict environments.fission.io create/update RBAC permissions.
  • Monitor Fission function and builder namespaces for suspicious activity.

Evidence notes

Evidence for this CVE can be found at [resourceLinkAnnotations].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50566 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50566

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50566 NVD vulnerability detail

    Publisher, destination, and source semantics verified

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

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.