Spinnaker is an open source, multi-cloud continuous delivery platform. Prior to 2026.1.0, 2026.0.3, 2025.4.4, and 2025.3.3, unsafe YAML processing bypasses safe deserialization when using CloudFormation deployments or CloudFoundry baking. The use of a non-safe constructor allows arbitrary loading of Java classes, leading to remote code execution.
This issue is fixed in versions 2026.1.0, 2026.0.3, 2025.4.4, and 2025.3.3.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 3
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Linuxfoundation Spinnaker
cpe:2.3:a:linuxfoundation:spinnaker:*:*:*:*:*:*:*:*
|
— |
2025.3.3
|
|
Linuxfoundation Spinnaker
cpe:2.3:a:linuxfoundation:spinnaker:*:*:*:*:*:*:*:*
|
2025.4.0
|
2025.4.4
|
|
Linuxfoundation Spinnaker
cpe:2.3:a:linuxfoundation:spinnaker:*:*:*:*:*:*:*:*
|
2026.0.0
|
2026.0.3
|
References 4
https://github.com/spinnaker/spinnaker/commit/4cbe1d5fea9df573aadfd8b093fb4b594…
security-advisories@github.com
https://github.com/spinnaker/spinnaker/commit/e57c0db4584b398473a7bbb19402ce6c1…
security-advisories@github.com
https://github.com/spinnaker/spinnaker/commit/f69d7b534d068ed74d0d3a1fbf17e2c94…
security-advisories@github.com
https://github.com/spinnaker/spinnaker/security/advisories/GHSA-c8q4-9h32-2ww8
security-advisories@github.com