PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-50545 fission CVE debrief

CVE-2026-50545 is a critical vulnerability in Fission, an open-source, Kubernetes-native serverless framework. The vulnerability has a CVSS score of 9.9 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-50545). The Environment.spec.runtime.podSpec / spec.builder.podSpec passthrough lacked validation, and MergePodSpec propagated dangerous fields into the generated pods. This issue has been patched in version 1.24.0.

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 prior to version 1.24.0 should update to the latest version to mitigate this vulnerability.

Technical summary

The vulnerability is caused by the lack of validation in the Environment.spec.runtime.podSpec / spec.builder.podSpec passthrough and the propagation of dangerous fields into the generated pods by MergePodSpec. This could allow an attacker to execute arbitrary code or escalate privileges.

Defensive priority

high

Recommended defensive actions

  • Update to Fission version 1.24.0 or later.
  • Review and validate podSpec configurations to prevent propagation of dangerous fields.

Evidence notes

The vulnerability is patched in version 1.24.0. References: [ref-6](https://github.com/fission/fission/releases/tag/v1.24.0), [ref-4](https://github.com/fission/fission/pull/3390), [ref-5](https://github.com/fission/fission/pull/3391), [ref-7](https://github.com/fission/fission/security/advisories/GHSA-wmgg-3p4h-48x7).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50545 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50545

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

  • CVE-2026-50545 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50545

    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.