Spinnaker has uon-safe yaml deserialization, allowing RCE when using specific types
Date: 2026-06
Affected: maven/io.spinnaker.orca:orca-core, maven/io.spinnaker.orca:orca-core, maven/io.spinnaker.rosco:rosco-core
Attack vector: deserialization
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-44795
CWE: CWE-470
CWE-502
CVSS: 8.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N)

### Impact There's an unsafe YAML processing vulnerability that bypasses safe deserialization. This impacts users when when performing: * CloudFormation deployments * CloudFoundry Baking The usage of a non-safe constructor use allows arbitrary loading of Java classes leading to RCE. ### Patches 2025.3.3, 2026.0.3 and 2025.4.4. ### Workarounds Disable the CloudFormation system and cloudfoundry baking operations. ### Resources Join Spinnaker on Slack for more information!


Mitigations:

Architectural layers (MAESTRO):