Vulnerability-Lookup

CVE-2026-44937 (GCVE-0-2026-44937)

Vulnerability from cvelistv5 – Published: 2026-07-06 09:52 – Updated: 2026-07-06 12:46

Title

SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components

Summary

Potential forgery of webhook requests when using a unauthenticated webhook in 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 0.12.5 could be used by remote attackers to cause a denial of service or a downgrade attack on other repositories on the system.

Severity

8.3 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-06 12:46 UTC

CWE

CWE-918 - Server-Side request forgery (SSRF)

Assigner

suse mitre root

References

1 reference

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

Impacted products

1 product

Vendor	Product	Version	CPE status
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)	guessed

Date Public

2026-05-28 09:44

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44937

Vulnerability from fkie_nvd - Published: 2026-07-06 11:16 - Updated: 2026-07-09 20:24

Severity

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

Summary

References

	URL	Tags
	meissner@suse.de	https://github.com/rancher/fleet/security/advisories/GHSA-jmf4-m7j9-g72r	Mitigation, Vendor Advisory

Impacted products

Vendor	Product	Version
suse	rancher_fleet	*
suse	rancher_fleet	*
suse	rancher_fleet	*
suse	rancher_fleet	*

JSON

To clipboard

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          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "meissner@suse.de",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44937",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-06T12:46:52.400471Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-06T11:16:27.727",
  "references": [
    {
      "source": "meissner@suse.de",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/rancher/fleet/security/advisories/GHSA-jmf4-m7j9-g72r"
    }
  ],
  "sourceIdentifier": "meissner@suse.de",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "meissner@suse.de",
      "type": "Secondary"
    }
  ]
}

GHSA-JMF4-M7J9-G72R

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

Summary

Rancher Fleet has Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components

Details

Impact

A vulnerability has been identified in Fleet when the webhook endpoint is configured without a secret; an attacker can forge webhook requests. The attacker doesn't need to know the specific repository or path configured in the GitRepo resource to make Fleet process these requests.

An attacker can exploit this vulnerability to cause the following impacts: 1. Trigger continuous repository re-cloning, which increases network traffic and can deplete resources on the management cluster. 2. Downgrade running services to any historical revision available in the remote Git repository. This risk applies if the attacker has read access to the target Git repository and knows its configured path.

Please consult the associated MITRE ATT&CK - Technique - T1499.004: Endpoint Denial of Service for further information about this category of attack.

Patches

To resolve this vulnerability, upgrade Fleet to a patched version. This upgrade version escapes the URL and path to the remote repository received from webhooks, which prevents regular expressions from being used as a replacement for the URL and path.

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 to only enable webhooks with a shared secret.

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

7.5 (High)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/fleet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.15.0"
            },
            {
              "fixed": "0.15.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/fleet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.14.0"
            },
            {
              "fixed": "0.14.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/fleet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.13.0"
            },
            {
              "fixed": "0.13.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/rancher/fleet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.12.0"
            },
            {
              "fixed": "0.12.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44937"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-01T20:44:24Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nA vulnerability has been identified in Fleet when the webhook endpoint is configured without a secret; an attacker can forge webhook requests. The attacker doesn\u0027t need to know the specific repository or path configured in the GitRepo resource to make Fleet process these requests.\n\nAn attacker can exploit this vulnerability to cause the following impacts:\n1. Trigger continuous repository re-cloning, which increases network traffic and can deplete resources on the management cluster.\n2. Downgrade running services to any historical revision available in the remote Git repository. This risk applies if the attacker has read access to the target Git repository and knows its configured path.\n\nPlease consult the associated  [MITRE ATT\u0026CK - Technique - T1499.004: Endpoint Denial of Service](https://attack.mitre.org/techniques/T1499/) for further information about this category of attack.\n\n### Patches\nTo resolve this vulnerability, upgrade Fleet to a patched version. This upgrade version escapes the URL and path to the remote repository received from webhooks, which prevents regular expressions from being used as a replacement for the URL and path.\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 to only enable webhooks with a shared secret.\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-jmf4-m7j9-g72r",
  "modified": "2026-07-01T20:44:24Z",
  "published": "2026-07-01T20:44:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rancher/fleet/security/advisories/GHSA-jmf4-m7j9-g72r"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rancher/fleet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rancher Fleet has Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components"
}

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

Scope

4 vulnerabilities in this advisory, including CVE-2026-44937.

CVE-2026-44937

Known affected: 4 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.

Detection rules are retrieved from Rulezet.

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-2026-44937 (GCVE-0-2026-44937)

FKIE_CVE-2026-44937

GHSA-JMF4-M7J9-G72R

Impact

Patches

Workarounds

Credits

References

WID-SEC-W-2026-1715

Tags

Sightings

Nomenclature

Related by attack behaviour