CVE-2026-49821 Details
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, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.
A vulnerability exists in Fission versions prior to 1.24.0, specifically within the builder manager controller's handling of Package Custom Resource Definitions (CRDs). The issue arises because the controller did not verify that the environment namespace specified in the Package CRD matched its metadata namespace. This oversight allowed an attacker with the 'packages.fission.io/create' permission to reference environments in other namespaces, execute commands in those namespaces, and exfiltrate sensitive information, such as the 'fission-builder' service account token, which could be used to access Secrets and ConfigMaps in the victim namespace.
Users can upgrade to Fission version 1.24.0 or later to address this vulnerability. Instructions for upgrading are available in the Fission installation guide.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 10, 2026CISA-ADP
Assessed Jun 10, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/fission/fission/pull/3379 | [email protected] | Source CodeVendor |
| https://github.com/fission/fission/releases/tag/v1.24.0 | [email protected] | Release NotesVendor |
| https://github.com/fission/fission/security/advisories/GHSA-vjhc-cf4p-72q4 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-441 | Unintended Proxy or Intermediary ('Confused Deputy') | [email protected] |
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Fission | <= 1.23.0 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 10, 2026 | New CVE Received | [email protected] |