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PatchSiren cyber security CVE debrief

CVE-2026-49821 fission CVE debrief

CVE-2026-49821 is a high-severity vulnerability in Fission, an open-source, Kubernetes-native serverless framework. The issue arises from the buildermgr controller processing Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This vulnerability has been patched in version 1.24.0.

Vendor
fission
Product
Unknown
CVSS
HIGH 7.7
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, especially those who utilize the framework for deploying functions and applications on Kubernetes, should be aware of this vulnerability. Given its high CVSS score of 7.7, it is crucial for users to assess their exposure and take necessary actions.

Technical summary

The vulnerability exists in the buildermgr controller of Fission, where it fails to verify the namespace of Package.spec.environment with Package.metadata.namespace. This oversight could potentially allow for unauthorized access or modifications. The Common Vulnerabilities and Exposures (CVE) score for this issue is 7.7, indicating a high severity level. The vulnerability has been addressed in Fission version 1.24.0.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Fission version 1.24.0 or later to patch the vulnerability.
  • Review and verify the namespace configurations for Package CRDs to ensure they match the expected settings.

Evidence notes

The CVE-2026-49821 vulnerability details were obtained from official sources, including the CVE record and NVD detail pages. Additional information was gathered from references provided by security advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49821 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49821

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

  • CVE-2026-49821 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49821

    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.