Remote Code Execution in Spinnaker via Unsafe YAML Processing

Publication date: 2026-07-10

Last updated on: 2026-07-10

Assigner: GitHub, Inc.

Description

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-10

Last Modified

2026-07-10

Generated

2026-07-11

AI Q&A

2026-07-11

EPSS Evaluated

N/A

NVD

CVE-2026-44795

Affected Vendors & Products

Vendor	Product	Version / Range
spinnaker	spinnaker	to 2026.1.0 (exc)
spinnaker	spinnaker	to 2026.0.3 (exc)
spinnaker	spinnaker	to 2025.4.4 (exc)
spinnaker	spinnaker	to 2025.3.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-470	The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Impact Analysis

The vulnerability can lead to remote code execution, meaning an attacker could execute arbitrary code on the affected system. This can compromise the confidentiality, integrity, and availability of the system, potentially allowing unauthorized access, data theft, or disruption of services.

Mitigation Strategies

To mitigate this vulnerability, upgrade Spinnaker to one of the fixed versions: 2026.1.0, 2026.0.3, 2025.4.4, or 2025.3.3.

Executive Summary

This vulnerability exists in Spinnaker, an open source multi-cloud continuous delivery platform. Prior to certain fixed versions, unsafe YAML processing bypasses safe deserialization when using CloudFormation deployments or CloudFoundry baking. Specifically, the use of a non-safe constructor in YAML processing allows arbitrary loading of Java classes, which can lead to remote code execution.

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