Vulnerability-Lookup

CVE-2026-44939 (GCVE-0-2026-44939)

Vulnerability from cvelistv5 – Published: 2026-06-19 12:13 – Updated: 2026-06-24 03:56

Title

Command injection through unsanitized YAML parameter in Rancher

Summary

A command injection vulnerability in the Rancher Manager cluster before 2.14.2 import endpoint /v3/import/{token}_{clusterId}.yaml through unsanitized YAML parameters could allow remote attackers to break out of an image, and execute e.g. malicious containers.

Severity

9.4 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 00:00 UTC

CWE

CWE-95 - Improper neutralization of directives in dynamically evaluated code ('eval injection')

Assigner

suse mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/rancher/rancher/security/advis…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
SUSE	Rancher	Affected: 2.14.0 , < 2.14.2 (semver) Affected: 2.13.0 , < 2.13.6 (semver) Affected: 2.12.0 , < 2.12.10 (semver) Affected: 2.11.0 , < 2.11.14 (semver) Affected: 2.10.0 , < 2.10.12 (semver)	guessed

Date Public

2026-05-27 16:36

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44939

Vulnerability from fkie_nvd - Published: 2026-06-19 13:16 - Updated: 2026-06-24 05:17

Severity

9.4 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Summary

References

	URL	Tags
	meissner@suse.de	https://github.com/rancher/rancher/security/advisories/GHSA-mhc6-2gfq-xx62

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "role": "CISA Coordinator",
          "timestamp": "2026-06-23T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-19T13:16:30.583",
  "references": [
    {
      "source": "meissner@suse.de",
      "url": "https://github.com/rancher/rancher/security/advisories/GHSA-mhc6-2gfq-xx62"
    }
  ],
  "sourceIdentifier": "meissner@suse.de",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-95"
        }
      ],
      "source": "meissner@suse.de",
      "type": "Secondary"
    }
  ]
}

GHSA-MHC6-2GFQ-XX62

Vulnerability from github – Published: 2026-07-01 20:44 – Updated: 2026-07-01 20:44

Summary

Rancher vulnerable to command injection through unsanitized YAML parameter

Details

Impact

A critical command injection vulnerability has been identified in the Rancher Manager cluster import endpoint /v3/import/{token}_{clusterId}.yaml through unsanitized YAML parameters. This endpoint accepts an authImage query parameter that is rendered without sanitization into a generated Kubernetes manifest template. By including URL-encoded newlines in the parameter value, an attacker can break out of the image: field to inject arbitrary YAML keys and malicious configurations, such as commands to execute malicious containers.

Exploitation of this vulnerability requires the following conditions to be met: - Attackers must obtain a valid cluster registration token (these tokens may be exposed, for example, through documentation, screenshots, or insecure communication channels). - The victim’s cluster operator must execute kubectl apply against a maliciously crafted URL.

When a victim applies this compromised manifest using kubectl apply, a DaemonSet is deployed with the injected configuration. This DaemonSet: - Runs on all control-plane nodes with hostNetwork: true enabled. - Uses the cattle service account, which possesses cluster-admin privileges. - Mounts /etc/kubernetes directly from the host. - Executes attacker-controlled commands via the injected command: field.

An attacker who successfully exploits this vulnerability could:

Achieve full control over downstream Kubernetes clusters.
Execute arbitrary code on control-plane nodes with elevated privileges.
Access sensitive cluster secrets and configurations via the privileged service account.
Disrupt cluster operations by manipulating critical control-plane workloads.
Establish persistent access through the deployed DaemonSet.

Note: If you believe that you might have been impacted by this vulnerability, it's highly advised to review your clusters' logs and deployment logs for signs of malicious deployments and to rotate all service accounts and credentials that might have been exposed in such a scenario.

Please refer to the associated MITRE ATT&CK - Technique - Deploy Container for further information about this category of attack.

Patches

This vulnerability is addressed by validating the authImage parameter to ensure it contains only valid OCI image reference characters, rejecting any input containing newlines, whitespace, or other characters that could break YAML syntax.

Patched versions of Rancher include release v2.14.2, v2.13.6, v2.12.10, v2.11.14 and v2.10.12.

Workarounds

If upgrading to a patched version immediately is not feasible, users are encouraged to apply the following workaround:

Review the kube-api-auth DaemonSet: Inspect downstream clusters for the kube-api-auth DaemonSet within the cattle-system namespace (which targets control-plane nodes). Review this resource configuration carefully for:
Unexpected command: or args: fields in the container specification.
References to non-standard or suspicious container images.
Any modifications occurring after the initial cluster import.
Validate manifest integrity: Before running kubectl apply on any import manifests, verify that the source URLs originate from trusted sources and match expected patterns.

Credits

This security issue was reported by the following collaborators according to our responsible disclosure policy:

Radisauskas Arnoldas from NATO and the NATO Cyber Security Centre (NCSC).
Michael Wollner from Deutsche Telekom AG.

References

If you have any questions or comments about this advisory: - Reach out to the SUSE Rancher Security team for security related inquiries. - Open an issue in the Rancher repository. - Verify with our support matrix and product support lifecycle.

Severity

9.6 (Critical)


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

9.4 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.14.0"
            },
            {
              "fixed": "2.14.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.13.0"
            },
            {
              "fixed": "2.13.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.12.0"
            },
            {
              "fixed": "2.12.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.11.0"
            },
            {
              "fixed": "2.11.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.10.0"
            },
            {
              "fixed": "2.10.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/rancher"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260617231817-2aa77eb283e7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44939"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-95"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T20:44:33Z",
    "nvd_published_at": "2026-06-19T13:16:30Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\nA critical command injection vulnerability has been identified in the Rancher Manager cluster import endpoint  `/v3/import/{token}_{clusterId}.yaml` through unsanitized YAML parameters. This endpoint accepts an `authImage` query parameter that is rendered without sanitization into a generated Kubernetes manifest template. By including URL-encoded newlines in the parameter value, an attacker can break out of the `image:` field to inject arbitrary YAML keys and malicious configurations, such as commands to execute malicious containers.\n\nExploitation of this vulnerability requires the following conditions to be met:\n- Attackers must obtain a valid cluster registration token (these tokens may be exposed, for example, through documentation, screenshots, or insecure communication channels).\n- The victim\u2019s cluster operator must execute `kubectl apply` against a maliciously crafted URL. \n\nWhen a victim applies this compromised manifest using `kubectl apply`, a DaemonSet is deployed with the injected configuration. This DaemonSet:\n- Runs on all control-plane nodes with `hostNetwork: true` enabled.\n- Uses the `cattle` service account, which possesses `cluster-admin` privileges.\n- Mounts `/etc/kubernetes` directly from the host.\n- Executes attacker-controlled commands via the injected `command:` field.\n\nAn attacker who successfully exploits this vulnerability could:\n\n- Achieve full control over downstream Kubernetes clusters.\n- Execute arbitrary code on control-plane nodes with elevated privileges.\n- Access sensitive cluster secrets and configurations via the privileged service account.\n- Disrupt cluster operations by manipulating critical control-plane workloads.\n- Establish persistent access through the deployed DaemonSet.\n\n**Note:** If you believe that you might have been impacted by this vulnerability, it\u0027s highly advised to review your clusters\u0027 logs and deployment logs for signs of malicious deployments and to rotate all service accounts and credentials that might have been exposed in such a scenario.\n\nPlease refer to the associated  [MITRE ATT\u0026CK - Technique - Deploy Container](https://attack.mitre.org/techniques/T1610/) for further information about this category of attack.\n\n### Patches\nThis vulnerability is addressed by validating the `authImage` parameter to ensure it contains only valid OCI image reference characters, rejecting any input containing newlines, whitespace, or other characters that could break YAML syntax.\n\nPatched versions of Rancher include release `v2.14.2`, `v2.13.6`, `v2.12.10`, `v2.11.14` and `v2.10.12`. \n\n### Workarounds\nIf upgrading to a patched version immediately is not feasible, users are encouraged to apply the following workaround: \n\n- Review the `kube-api-auth` DaemonSet: Inspect downstream clusters for the `kube-api-auth` DaemonSet within the `cattle-system` namespace (which targets control-plane nodes). Review this resource configuration carefully for:\n  - Unexpected `command:` or `args:` fields in the container specification.\n  - References to non-standard or suspicious container images.\n  - Any modifications occurring after the initial cluster import.\n- Validate manifest integrity: Before running `kubectl apply` on any import manifests, verify that the source URLs originate from trusted sources and match expected patterns.\n\n### Credits\n\nThis security issue was reported by the following collaborators according to our responsible disclosure policy:\n\n- Radisauskas Arnoldas from NATO and the NATO Cyber Security Centre (NCSC).\n- Michael Wollner from Deutsche Telekom AG.\n\n### References\nIf you have any questions or comments about this advisory:\n- Reach out to the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries.\n- Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository.\n- Verify with our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).",
  "id": "GHSA-mhc6-2gfq-xx62",
  "modified": "2026-07-01T20:44:33Z",
  "published": "2026-07-01T20:44:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rancher/rancher/security/advisories/GHSA-mhc6-2gfq-xx62"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44939"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rancher/rancher/commit/2aa77eb283e7451d605fb85e1bd9b1791cd73875"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rancher/rancher"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Rancher vulnerable to command injection through unsanitized YAML parameter"
}

WID-SEC-W-2026-1716

Vulnerability from csaf_certbund - Published: 2026-05-27 22:00 - Updated: 2026-05-27 22:00

Summary

Rancher: Mehrere Schwachstellen

Severity

Hoch

Scope

3 vulnerabilities in this advisory, including CVE-2026-44939.

CVE-2026-44939

Known affected: 5 products

Open the full advisory

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-44939 (GCVE-0-2026-44939)

FKIE_CVE-2026-44939

GHSA-MHC6-2GFQ-XX62

Impact

Patches

Workarounds

Credits

References

WID-SEC-W-2026-1716

Tags

Sightings

Nomenclature

Related by attack behaviour