Spinnaker has uon-safe yaml deserialization, allowing RCE when using specific types

CVE-2026-44795 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

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!

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-06-22 20:43:37 UTC
Updated
2026-06-22 20:43:39 UTC
GitHub reviewed
2026-06-22 20:43:37 UTC

EPSS Score

No EPSS score in this advisory JSON.

CVSS Scores

Base score Version Severity Vector
8.5 3.1 —
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-c8q4-9h32-2ww8 ↗
CVE CVE-2026-44795 ↗

CWEs

CWE id Name
CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CWE-502 Deserialization of Untrusted Data

Affected packages (6)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven io.spinnaker.rosco:rosco-core < 2025.3.3 2025.3.3 —
maven io.spinnaker.orca:orca-core < 2025.3.3 2025.3.3 —
maven io.spinnaker.rosco:rosco-core >= 2025.4.0, < 2025.4.4 2025.4.4 —
maven io.spinnaker.rosco:rosco-core >= 2026.0.0, < 2026.0.3 2026.0.3 —
maven io.spinnaker.orca:orca-core >= 2025.4.0, < 2025.4.4 2025.4.4 —
maven io.spinnaker.orca:orca-core >= 2026.0.0, < 2026.0.3 2026.0.3 —

References

cvelogic Threat Intelligence