Vulnerability-Lookup

CVE-2025-71261 (GCVE-0-2025-71261)

Vulnerability from cvelistv5 – Published: 2026-06-16 15:42 – Updated: 2026-06-16 17:52

Title

Harvester's SUSE Virtualization Registration Client Vulnerable to MITM and DOS

Summary

An attacker with network-level access between the SUSE Virtualization and Rancher Manager in SUSE Harvester before 1.8.0 could interfere with the TLS handshake and abuse it to bypass TLS as a security control.

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-295

Assigner

suse

References

1 reference

URL	Tags
https://github.com/harvester/harvester/security/a…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
SUSE	Harvester	Affected: 0 , < 1.8 (custom)

Date Public

2026-06-16 15:38

Show details on NVD website

JSON

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FKIE_CVE-2025-71261

Vulnerability from fkie_nvd - Published: 2026-06-16 17:16 - Updated: 2026-06-16 17:37

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Summary

References

	URL	Tags
	meissner@suse.de	https://github.com/harvester/harvester/security/advisories/GHSA-pgh9-mpwc-8jjf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "lang": "en",
      "value": "An attacker with network-level access between the SUSE Virtualization \nand Rancher Manager in SUSE Harvester before 1.8.0 could interfere with the TLS handshake and abuse it \nto bypass TLS as a security control."
    }
  ],
  "id": "CVE-2025-71261",
  "lastModified": "2026-06-16T17:37:16.933",
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GHSA-PGH9-MPWC-8JJF

Vulnerability from github – Published: 2026-05-06 20:16 – Updated: 2026-05-06 20:16

Summary

Harvester's SUSE Virtualization Registration Client Vulnerable to MITM and DOS

Details

Impact

A vulnerability has been identified in the SUSE Virtualization (Harvester) Rancher integration mechanism where by default the registration client uses an insecure TLS option that fails to verify the remote server’s certificate. This security gap could allow the execution of a man-in-the-middle (MitM) attack against SUSE Virtualization.

An attacker with network-level access between the SUSE Virtualization and Rancher Manager could interfere with the TLS handshake and abuse it to bypass TLS as a security control. The registration client could be misled to send cluster registration requests to an impersonated remote service. Additionally, because the system processes response payloads without performing size validation, an attacker could induce a memory buffer overflow, leading to a potential crash of the SUSE Virtualization registration controller.

Note that this vulnerability only affects the cluster registration configuration (the cluster-registration-url setting) which is distinct from the secured configuration used to maintain operational connectivity between SUSE Virtualization and Rancher Manager, as well as between the manager and hosted downstream clusters.

Please consult the associated MITRE ATT&CK - Technique - Adversary-in-the-Middle and MITRE ATT&CK - Technique - Endpoint Denial of Service: Application or System Exploitation for further information about this category of attack.

Patches

This vulnerability is addressed by updating the registration client’s default behaviour to validate the certificate presented by the remote server against the list of trusted system root certificate authority (CA) and those defined by the additional-ca setting.

Patched versions of SUSE Virtualization include releases v1.8.0 or newer.

Workarounds

If developers can't upgrade to a fixed version, ensure that only authorized cluster administrators can access and modify the cluster-registration-url setting.

Resources

If there are 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 SUSE support matrix and product support lifecycle.

Severity

8.6 (High)


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

Show details on source website

JSON

To clipboard

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    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/harvester/harvester"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-71261"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T20:16:08Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA vulnerability has been identified in the [SUSE Virtualization (Harvester) Rancher integration mechanism](https://docs.harvesterhci.io/v1.7/rancher/rancher-integration) where by default the registration client uses an insecure TLS option that fails to verify  the remote server\u2019s certificate. This security gap could allow the execution of a man-in-the-middle (MitM) attack against SUSE Virtualization.\n\nAn attacker with network-level access between the SUSE Virtualization and Rancher Manager could interfere with the TLS handshake and abuse it to bypass TLS as a security control. The registration client could be misled to send cluster registration requests to an impersonated remote service. Additionally, because the system processes response payloads without performing size validation, an attacker could induce a memory buffer overflow, leading to a potential crash of the SUSE Virtualization registration controller.\n\nNote that this vulnerability only affects the cluster registration configuration (the `cluster-registration-url` setting) which is distinct from the secured configuration used to maintain operational connectivity between SUSE Virtualization and Rancher Manager, as well as between the manager and hosted downstream clusters.\n\nPlease consult the associated[ MITRE ATT\u0026CK - Technique - Adversary-in-the-Middle](https://attack.mitre.org/techniques/T1557/) and [MITRE ATT\u0026CK - Technique - Endpoint Denial of Service: Application or System Exploitation](https://attack.mitre.org/techniques/T1499/004/) for further information about this category of attack.\n\n### Patches\n\nThis vulnerability is addressed by updating the registration client\u2019s default behaviour to validate the certificate presented by the remote server against the list of trusted system root certificate authority (CA) and those defined by the `additional-ca` setting.\n\nPatched versions of SUSE Virtualization include releases v1.8.0 or newer.\n\n### Workarounds\n\nIf developers can\u0027t upgrade to a fixed version, ensure that only authorized cluster administrators can access and modify the `cluster-registration-url` setting.\n\n### Resources\n\nIf there are 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 SUSE [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).",
  "id": "GHSA-pgh9-mpwc-8jjf",
  "modified": "2026-05-06T20:16:08Z",
  "published": "2026-05-06T20:16:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/harvester/harvester/security/advisories/GHSA-pgh9-mpwc-8jjf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/harvester/harvester"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Harvester\u0027s SUSE Virtualization Registration Client Vulnerable to MITM and DOS"
}

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-2025-71261 (GCVE-0-2025-71261)

FKIE_CVE-2025-71261

GHSA-PGH9-MPWC-8JJF

Impact

Patches

Workarounds

Resources

Tags

Sightings

Nomenclature