CVE-2026-44795: Rosco core Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-c8q4-9h32-2ww8
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CVSS 8.5
CWE-470 CWE-502
Published
Advisory Summary

CVE-2026-44795 is a HIGH (CVSS 8.5) remote code execution vulnerability (CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')) affecting Rosco core libraries in the Maven ecosystem. The issue involves spinnaker has non-safe yaml deserialization, allowing rce when using specific types. Remediation is available by upgrading affected packages to version 2025.3.3, 2025.4.4, 2026.0.3.

CVE-2026-44795 at a Glance

CVE Identifier CVE-2026-44795
GHSA Identifier GHSA-c8q4-9h32-2ww8
Severity HIGH
CVSS v3.1 Base Score 8.5
CWE Classification CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
Affected Product Rosco core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-44795

To remediate this vulnerability, upgrade all affected Rosco core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

io.spinnaker.rosco:rosco-core fixed: 2025.3.3 
<dependency>
    <groupId>io.spinnaker.rosco</groupId>
    <artifactId>rosco-core</artifactId>
    <version>2025.3.3</version>
</dependency>
io.spinnaker.orca:orca-core fixed: 2025.3.3 
<dependency>
    <groupId>io.spinnaker.orca</groupId>
    <artifactId>orca-core</artifactId>
    <version>2025.3.3</version>
</dependency>
io.spinnaker.rosco:rosco-core fixed: 2025.4.4 
<dependency>
    <groupId>io.spinnaker.rosco</groupId>
    <artifactId>rosco-core</artifactId>
    <version>2025.4.4</version>
</dependency>
io.spinnaker.rosco:rosco-core fixed: 2026.0.3 
<dependency>
    <groupId>io.spinnaker.rosco</groupId>
    <artifactId>rosco-core</artifactId>
    <version>2026.0.3</version>
</dependency>
io.spinnaker.orca:orca-core fixed: 2025.4.4 
<dependency>
    <groupId>io.spinnaker.orca</groupId>
    <artifactId>orca-core</artifactId>
    <version>2025.4.4</version>
</dependency>
io.spinnaker.orca:orca-core fixed: 2026.0.3 
<dependency>
    <groupId>io.spinnaker.orca</groupId>
    <artifactId>orca-core</artifactId>
    <version>2026.0.3</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=io.spinnaker.rosco

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-44795, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.spinnaker.rosco

Analyze the terminal output to locate any version of Rosco core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2025.3.3), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.spinnaker.rosco command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection'), where 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. In Rosco core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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!

CVE-2026-44795 Affected Rosco core Versions

6 component(s)
Fixed Versions:
2025.3.32025.4.42026.0.3
Product / Package Ecosystem Affected Versions Fixed Version
io.spinnaker.rosco:rosco-core
maven/io.spinnaker.rosco/rosco-core
Maven
< 2025.3.3
2025.3.3
io.spinnaker.orca:orca-core
maven/io.spinnaker.orca/orca-core
Maven
< 2025.3.3
2025.3.3
io.spinnaker.rosco:rosco-core
maven/io.spinnaker.rosco/rosco-core
Maven
≥ 2025.4.0
< 2025.4.4
2025.4.4
io.spinnaker.rosco:rosco-core
maven/io.spinnaker.rosco/rosco-core
Maven
≥ 2026.0.0
< 2026.0.3
2026.0.3
io.spinnaker.orca:orca-core
maven/io.spinnaker.orca/orca-core
Maven
≥ 2025.4.0
< 2025.4.4
2025.4.4
io.spinnaker.orca:orca-core
maven/io.spinnaker.orca/orca-core
Maven
≥ 2026.0.0
< 2026.0.3
2026.0.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/spinnaker/spinnaker/security/advisories/GHSA-c8q4-9h32-2ww8
NVD — CVE-2026-44795 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44795
Security Fix Commit FIX COMMIT
https://github.com/spinnaker/spinnaker/commit/4cbe1d5fea9df573aadfd8b093fb4b594b354ee5
Security Fix Commit FIX COMMIT
https://github.com/spinnaker/spinnaker/commit/e57c0db4584b398473a7bbb19402ce6c1e89b627
Security Fix Commit FIX COMMIT
https://github.com/spinnaker/spinnaker/commit/f69d7b534d068ed74d0d3a1fbf17e2c945d36e5e
Rosco core Source Repository REPOSITORY
https://github.com/spinnaker/spinnaker

Frequently Asked Questions

What is CVE-2026-44795?
CVE-2026-44795 is a security vulnerability in Rosco core involving Spinnaker has non-safe yaml deserialization, allowing RCE when using specific types under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection').
Which Rosco core versions are affected?
Affected versions include releases prior to 2025.3.3, 2025.4.4, 2026.0.3 across affected packages: io.spinnaker.rosco:rosco-core, io.spinnaker.orca:orca-core.
What version fixes CVE-2026-44795?
Upgrading to 2025.3.3, 2025.4.4, 2026.0.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rosco-core affected?
Yes, io.spinnaker.rosco:rosco-core is affected in releases prior to 2025.3.3, 2025.4.4, 2026.0.3. Upgrade your dependency to 2025.3.3, 2025.4.4, 2026.0.3 or later.
Is orca-core affected?
Yes, io.spinnaker.orca:orca-core is affected in releases prior to 2025.3.3, 2025.4.4, 2026.0.3. Upgrade your dependency to 2025.3.3, 2025.4.4, 2026.0.3 or later.
What is the CVSS score of CVE-2026-44795?
CVE-2026-44795 has a CVSS v3.1 base score of 8.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N.
What CWE is associated with CVE-2026-44795?
CVE-2026-44795 is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') (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.).
How can I check Maven dependencies for CVE-2026-44795?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.spinnaker.rosco'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c8q4-9h32-2ww8",
  "modified" : "2026-08-05T22:37:48Z",
  "published" : "2026-06-22T20:43:37Z",
  "aliases" : [ "CVE-2026-44795" ],
  "summary" : "Spinnaker has non-safe yaml deserialization, allowing RCE when using specific types",
  "details" : "### Impact\nThere's an unsafe YAML processing vulnerability that bypasses safe deserialization. This impacts users when when performing:\n* CloudFormation deployments\n* CloudFoundry Baking\n\nThe usage of a non-safe constructor use allows arbitrary loading of Java classes leading to RCE.\n\n### Patches\n 2025.3.3, 2026.0.3 and 2025.4.4.\n\n### Workarounds\nDisable the CloudFormation system and cloudfoundry baking operations.\n\n### Resources\nJoin Spinnaker on Slack for more information!",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.rosco:rosco-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2025.3.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.orca:orca-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2025.3.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.rosco:rosco-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2025.4.0"
      }, {
        "fixed" : "2025.4.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.rosco:rosco-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2026.0.0"
      }, {
        "fixed" : "2026.0.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.orca:orca-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2025.4.0"
      }, {
        "fixed" : "2025.4.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.spinnaker.orca:orca-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2026.0.0"
      }, {
        "fixed" : "2026.0.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/spinnaker/spinnaker/security/advisories/GHSA-c8q4-9h32-2ww8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44795"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/spinnaker/spinnaker/commit/4cbe1d5fea9df573aadfd8b093fb4b594b354ee5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/spinnaker/spinnaker/commit/e57c0db4584b398473a7bbb19402ce6c1e89b627"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/spinnaker/spinnaker/commit/f69d7b534d068ed74d0d3a1fbf17e2c945d36e5e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/spinnaker/spinnaker"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-470", "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-22T20:43:37Z",
    "nvd_published_at" : "2026-07-10T22:16:41Z"
  }
}