Vulnerability-Lookup

GHSA-C8Q4-9H32-2WW8

Vulnerability from github – Published: 2026-06-22 20:43 – Updated: 2026-06-22 20:43

Summary

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

Details

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!

Severity

8.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.rosco:rosco-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2025.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.orca:orca-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2025.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.rosco:rosco-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2025.4.0"
            },
            {
              "fixed": "2025.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.rosco:rosco-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2026.0.0"
            },
            {
              "fixed": "2026.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.orca:orca-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2025.4.0"
            },
            {
              "fixed": "2025.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.spinnaker.orca:orca-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2026.0.0"
            },
            {
              "fixed": "2026.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44795"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-470",
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-22T20:43:37Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nThere\u0027s 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!",
  "id": "GHSA-c8q4-9h32-2ww8",
  "modified": "2026-06-22T20:43:37Z",
  "published": "2026-06-22T20:43:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/spinnaker/spinnaker/security/advisories/GHSA-c8q4-9h32-2ww8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/spinnaker/spinnaker"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Spinnaker has uon-safe yaml deserialization, allowing RCE when using specific types"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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