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CVE-2026-50563 fission CVE debrief

CVE-2026-50563 is a critical vulnerability in Fission, an open-source, Kubernetes-native serverless framework. The issue allows a tenant to supply Function.spec.podspec directly, which is then merged into the executor-built podspec and used to create a Deployment. This could potentially allow an attacker to execute arbitrary code in the user's container image. The vulnerability has been patched in version 1.24.0 of Fission.

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

Who should care

Users of Fission, an open-source, Kubernetes-native serverless framework, should be aware of this vulnerability if they are using a version prior to 1.24.0.

Technical summary

The Container Executor path in Fission allows a tenant to supply Function.spec.podspec directly. The executor merges it into the executor-built podspec and creates a Deployment whose pods run the user's container image. This could potentially allow an attacker to execute arbitrary code in the user's container image.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Fission version 1.24.0 or later.
  • Review and restrict the supply of Function.spec.podspec to prevent arbitrary code execution.

Evidence notes

The vulnerability has a CVSS score of 9.9 and is considered CRITICAL.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50563 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50563

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

  • CVE-2026-50563 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50563

    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.