Vulnerability-Lookup

CVE-2026-44935 (GCVE-0-2026-44935)

Vulnerability from cvelistv5 – Published: 2026-07-02 16:00 – Updated: 2026-07-02 17:30

Title

Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer

Summary

Missing validation of "valuesFrom" references in Helm Deployer of SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.15 could be used by owners of one tenant to access fleet credentials of other tenants.

Severity

9.9 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-1287 - Improper validation of specified type of input

Assigner

suse

References

1 reference

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

Impacted products

1 product

Vendor	Product	Version
SUSE	Rancher	Affected: 0.15.0 , < 0.15.2 (semver) Affected: 0.14.0 , < 0.14.6 (semver) Affected: 0.13.0 , < 0.13.11 (semver) Affected: 0.12.0 , < 0.12.15 (semver)

Date Public

2026-05-28 15:26

Show details on NVD website

JSON

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FKIE_CVE-2026-44935

Vulnerability from fkie_nvd - Published: 2026-07-02 17:16 - Updated: 2026-07-02 18:16

Severity

9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	meissner@suse.de	https://github.com/rancher/fleet/security/advisories/GHSA-xr65-5cpm-g36x

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageName": "Fleett",
          "product": "Rancher",
          "repo": "https://github.com/rancher/fleet/",
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GHSA-XR65-5CPM-G36X

Vulnerability from github – Published: 2026-07-01 20:45 – Updated: 2026-07-01 20:45

Summary

Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer

Details

Impact

A vulnerability in Fleet for Rancher Manager affects multi-tenancy environments where different tenants share the same downstream clusters (e.g., different privileged or untrusted teams inside the same organization).

On unpatched versions, tenants could bypass restrictions to access any config map or secret across all namespaces on the downstream cluster. They can create cluster-wide resources using HelmOp or Bundle without authorization. Specifically, an attacker can exploit this vulnerability in the following ways: 1. Use valuesFrom in fleet.yaml(through a GitRepo resource) or a HelmOp resource to read the contents of any secret an on the downstream cluster, provided they know or can guess the name, namespace, and key. 2. DeployHelmOpandBundle` resources without being restricted to a specific service account for the Fleet agent.

If you use Fleet in a multi-tenant environment, it's recommended that you: - Review your cluster and Fleet deployments logs for indicators of unauthorized access across tenant namespaces. - Rotate any service accounts and credentials that might have been exposed.

Please consult the associated MITRE ATT&CK - Technique - Unsecured Credentials for further information about this category of attack.

Patches

To resolve this vulnerability, upgrade to a patched version of Fleet. The new Policy resource allows you to: - Configure GitRepos, HelmOps, and Bundles to require a specific service account for the Fleet agent on downstream clusters used for deployment. The agent uses these designated service accounts for operations, blocking access to unauthorized resources. - Restrict HelmOp repository and chart URLs by using a regular expression. The regular expression is automatically anchored with ^ and $, meaning it must match the entire URL string.

Like GitRepoRestriction, a Policy resource must be created in the specific namespace you want to restrict, and it only applies to that namespace.

Note: Before applying a policy, ensure that the required service account is available on the downstream clusters and is configured with least-privilege permissions.

Patched versions of Fleet include releases v0.15.2, v0.14.6, 0.13.11, and v0.12.15.

Workarounds

If you can't upgrade to a fixed version, please make sure that tenants do not have shared access to the same downstream clusters.

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).

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

9.9 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
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      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/fleet"
      },
      "ranges": [
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        }
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        "name": "github.com/rancher/fleet"
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              "introduced": "0.12.0"
            },
            {
              "fixed": "0.12.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44935"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T20:45:39Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\nA vulnerability in Fleet for Rancher Manager affects multi-tenancy environments where different tenants share the same downstream clusters (e.g., different privileged or untrusted teams inside the same organization). \n\nOn unpatched versions, tenants could bypass restrictions to access any config map or secret across all namespaces on the downstream cluster. They can create cluster-wide resources using `HelmOp` or `Bundle` without authorization.\nSpecifically, an attacker can exploit this vulnerability in the following ways:\n1. Use `valuesFrom` in `fleet.yaml`(through a `GitRepo` resource) or a `HelmOp resource to read the contents of any secret an on the downstream cluster, provided they know or can guess the name, namespace, and key.\n2. Deploy `HelmOp` and `Bundle` resources without being restricted to a specific service account for the Fleet agent.\n\nIf you use Fleet in a multi-tenant environment, it\u0027s recommended that you:\n- Review your cluster and Fleet deployments logs for indicators of unauthorized access across tenant namespaces.\n- Rotate any service accounts and credentials that might have been exposed.\n\nPlease consult the associated  [MITRE ATT\u0026CK - Technique - Unsecured Credentials](https://attack.mitre.org/techniques/T1552/) for further information about this category of attack.\n\n### Patches\nTo resolve this vulnerability, upgrade to a patched version of Fleet.  The new Policy resource allows you to:\n- Configure `GitRepos`, `HelmOps`, and `Bundles` to require a specific service account for the Fleet agent on downstream clusters used for deployment. The agent uses these designated service accounts for operations, blocking access to unauthorized resources.\n- Restrict `HelmOp` repository and chart URLs by using a regular expression. The regular expression is automatically anchored with `^` and `$`, meaning it must match the entire URL string.\n\nLike `GitRepoRestriction`, a Policy resource must be created in the specific namespace you want to restrict, and it only applies to that namespace.\n\n**Note:** Before applying a policy, ensure that the required service account is available on the downstream clusters and is configured with least-privilege permissions.\n\nPatched versions of Fleet include releases `v0.15.2`, `v0.14.6`, `0.13.11`, and `v0.12.15`.\n\n### Workarounds\nIf you can\u0027t upgrade to a fixed version, please make sure that tenants do not have shared access to the same downstream clusters.\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\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-xr65-5cpm-g36x",
  "modified": "2026-07-01T20:45:39Z",
  "published": "2026-07-01T20:45:39Z",
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer"
}

WID-SEC-W-2026-1715

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

Summary

Fleet: Mehrere Schwachstellen

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Fleet ist eine Open-Source-Plattform zur Geräteverwaltung, die es Unternehmen ermöglicht, ihre Infrastruktur zu überwachen und zu sichern.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Fleet ausnutzen, um Sicherheitsmechanismen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen oder Sicherheitskonfigurationen zu manipulieren.

Betroffene Betriebssysteme: - Linux - UNIX

CVE-2026-44935

Affected products

Known affected 4 products

Product	Identifier	Version	Remediation
Open Source Fleet <0.12.15 Open Source / Fleet		<0.12.15
Open Source Fleet <0.13.11 Open Source / Fleet		<0.13.11
Open Source Fleet <0.14.6 Open Source / Fleet		<0.14.6
Open Source Fleet <0.15.2 Open Source / Fleet		<0.15.2

CVE-2026-44936

Affected products

Known affected 4 products

Product	Identifier	Version	Remediation
Open Source Fleet <0.12.15 Open Source / Fleet		<0.12.15
Open Source Fleet <0.13.11 Open Source / Fleet		<0.13.11
Open Source Fleet <0.14.6 Open Source / Fleet		<0.14.6
Open Source Fleet <0.15.2 Open Source / Fleet		<0.15.2

CVE-2026-44937

Affected products

Known affected 4 products

Product	Identifier	Version	Remediation
Open Source Fleet <0.12.15 Open Source / Fleet		<0.12.15
Open Source Fleet <0.13.11 Open Source / Fleet		<0.13.11
Open Source Fleet <0.14.6 Open Source / Fleet		<0.14.6
Open Source Fleet <0.15.2 Open Source / Fleet		<0.15.2

CVE-2026-44938

Affected products

Known affected 4 products

Product	Identifier	Version	Remediation
Open Source Fleet <0.12.15 Open Source / Fleet		<0.12.15
Open Source Fleet <0.13.11 Open Source / Fleet		<0.13.11
Open Source Fleet <0.14.6 Open Source / Fleet		<0.14.6
Open Source Fleet <0.15.2 Open Source / Fleet		<0.15.2

References

6 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/rancher/fleet/security/advisor…	external
https://github.com/rancher/fleet/security/advisor…	external
https://github.com/rancher/fleet/security/advisor…	external
https://github.com/rancher/fleet/security/advisor…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Fleet ist eine Open-Source-Plattform zur Ger\u00e4teverwaltung, die es Unternehmen erm\u00f6glicht, ihre Infrastruktur zu \u00fcberwachen und zu sichern.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Fleet ausnutzen, um Sicherheitsmechanismen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuf\u00fchren oder Sicherheitskonfigurationen zu manipulieren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1715 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1715.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1715 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1715"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-xr65-5cpm-g36x vom 2026-05-27",
        "url": "https://github.com/rancher/fleet/security/advisories/GHSA-xr65-5cpm-g36x"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-hx4v-cxpf-vh8m vom 2026-05-27",
        "url": "https://github.com/rancher/fleet/security/advisories/GHSA-hx4v-cxpf-vh8m"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-jmf4-m7j9-g72r vom 2026-05-27",
        "url": "https://github.com/rancher/fleet/security/advisories/GHSA-jmf4-m7j9-g72r"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-864g-863m-vcvq vom 2026-05-27",
        "url": "https://github.com/rancher/fleet/security/advisories/GHSA-864g-863m-vcvq"
      }
    ],
    "source_lang": "en-US",
    "title": "Fleet: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-27T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-28T11:45:32.727+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1715",
      "initial_release_date": "2026-05-27T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-27T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c0.15.2",
                "product": {
                  "name": "Open Source Fleet \u003c0.15.2",
                  "product_id": "T054833"
                }
              },
              {
                "category": "product_version",
                "name": "0.15.2",
                "product": {
                  "name": "Open Source Fleet 0.15.2",
                  "product_id": "T054833-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:fleetdm:fleet:0.15.2"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c0.14.6",
                "product": {
                  "name": "Open Source Fleet \u003c0.14.6",
                  "product_id": "T054834"
                }
              },
              {
                "category": "product_version",
                "name": "0.14.6",
                "product": {
                  "name": "Open Source Fleet 0.14.6",
                  "product_id": "T054834-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:fleetdm:fleet:0.14.6"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c0.13.11",
                "product": {
                  "name": "Open Source Fleet \u003c0.13.11",
                  "product_id": "T054835"
                }
              },
              {
                "category": "product_version",
                "name": "0.13.11",
                "product": {
                  "name": "Open Source Fleet 0.13.11",
                  "product_id": "T054835-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:fleetdm:fleet:0.13.11"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c0.12.15",
                "product": {
                  "name": "Open Source Fleet \u003c0.12.15",
                  "product_id": "T054836"
                }
              },
              {
                "category": "product_version",
                "name": "0.12.15",
                "product": {
                  "name": "Open Source Fleet 0.12.15",
                  "product_id": "T054836-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:fleetdm:fleet:0.12.15"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Fleet"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-44935",
      "product_status": {
        "known_affected": [
          "T054836",
          "T054835",
          "T054834",
          "T054833"
        ]
      },
      "release_date": "2026-05-27T22:00:00.000+00:00",
      "title": "CVE-2026-44935"
    },
    {
      "cve": "CVE-2026-44936",
      "product_status": {
        "known_affected": [
          "T054836",
          "T054835",
          "T054834",
          "T054833"
        ]
      },
      "release_date": "2026-05-27T22:00:00.000+00:00",
      "title": "CVE-2026-44936"
    },
    {
      "cve": "CVE-2026-44937",
      "product_status": {
        "known_affected": [
          "T054836",
          "T054835",
          "T054834",
          "T054833"
        ]
      },
      "release_date": "2026-05-27T22:00:00.000+00:00",
      "title": "CVE-2026-44937"
    },
    {
      "cve": "CVE-2026-44938",
      "product_status": {
        "known_affected": [
          "T054836",
          "T054835",
          "T054834",
          "T054833"
        ]
      },
      "release_date": "2026-05-27T22:00:00.000+00:00",
      "title": "CVE-2026-44938"
    }
  ]
}

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.

Action not permitted

CVE-2026-44935 (GCVE-0-2026-44935)

FKIE_CVE-2026-44935

GHSA-XR65-5CPM-G36X

Impact

Patches

Workarounds

Credits

References

WID-SEC-W-2026-1715

Tags

Sightings

Nomenclature