Fission: Cross-namespace Package read via unvalidated PackageRef in Function admission webhook
Priority LOW 33CWE-284Published · 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-284.
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, a Fission Function spec carries three reference types — Secret, ConfigMap, and Package. The first two were namespace-validated by the admission webhook; PackageRef.Namespace was not. This issue has been patched in version 1.24.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00265 18th 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-3r8v-2xmj-5c39 |
- 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-3r8v-2xmj-5c39
Remediation
- Fix · CNA fission (fission) Fixed in 1.24.0
- Fix · GHSA-3r8v-2xmj-5c39 github.com/fission/fission (Go) Fixed in 1.24.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-49823
- 2026-10-03 Alias added: GHSA-3r8v-2xmj-5c39
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-2026-49823 · CVE Program
- CVE-2026-49823 · NVD
- FIRST EPSS
- GHSA-3r8v-2xmj-5c39 · GitHub Advisory Database · CC BY 4.0
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