Fission: Cross-namespace Environment reference in Package allows build-time command execution and SA token exfiltration
Priority LOW 33CWE-441Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Fix Fixed fission (fission): 1.24.0github.com/fission/fission (Go): 1.24.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fission | fission | before 1.24.0 | 1.24.0 | Patch available | CNA |
| — | github.com/fission/fission (Go) | before 1.24.0 | 1.24.0 | Patch available | GHSA-vjhc-cf4p-72q4 |
- fission Vendorfission Affected before 1.24.0 Fixed in 1.24.0 Patch available CNA
- github.com/fission/fission (Go) Vendor— Affected before 1.24.0 Fixed in 1.24.0 Patch available GHSA-vjhc-cf4p-72q4
Remediation
- Fix · CNA fission (fission) Fixed in 1.24.0
- Fix · GHSA-vjhc-cf4p-72q4 github.com/fission/fission (Go) Fixed in 1.24.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-49821
- 2026-10-03 Alias added: GHSA-vjhc-cf4p-72q4
References
More fission vulnerabilities
- TI-2026-34271 Improper access control in fission CVSS 3.1CRITICAL 9.8
- TI-2026-34273 Improper privilege management in fission CVSS 4.0HIGH 8.7
- TI-2026-37288 Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation CVSS 3.1CRITICAL 9.9
- TI-2026-37286 Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape CVSS 3.1CRITICAL 9.9
- TI-2026-37285 Fission Container Executor Function PodSpec Injection Leading to Node Escape CVSS 3.1CRITICAL 9.9
- TI-2026-37268 Fission Environment CRD PodSpec Injection Leading to Node Escape and Cluster Takeover CVSS 3.1CRITICAL 9.9
Sources
- CVE-2026-49821 · CVE Program
- CVE-2026-49821 · NVD
- FIRST EPSS
- GHSA-vjhc-cf4p-72q4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences