Vulnerability-Lookup

ubuntu-cve-2026-44393

Vulnerability from osv_ubuntu

Published

2026-06-04 16:16

Modified

2026-06-30 16:21

Summary

Details

An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.

Severity

7.4 (High)


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

7.4 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-44393	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-44393	REPORT
	https://wiki.openstack.org/wiki/OSSN/OSSN-0096	REPORT
	https://launchpad.net/bugs/2150316	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "oslo-messaging-zmq-receiver",
            "binary_version": "4.6.1-2ubuntu2"
          },
          {
            "binary_name": "python-oslo-messaging",
            "binary_version": "4.6.1-2ubuntu2"
          },
          {
            "binary_name": "python-oslo.messaging",
            "binary_version": "4.6.1-2ubuntu2"
          },
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "4.6.1-2ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@4.6.1-2ubuntu2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.0-1ubuntu1",
        "3.0.0-1ubuntu2",
        "4.5.0-1ubuntu1",
        "4.5.1-1ubuntu1",
        "4.6.1-2ubuntu1",
        "4.6.1-2ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "oslo-messaging-zmq-receiver",
            "binary_version": "5.35.0-0ubuntu4"
          },
          {
            "binary_name": "python-oslo.messaging",
            "binary_version": "5.35.0-0ubuntu4"
          },
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "5.35.0-0ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@5.35.0-0ubuntu4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.30.0-0ubuntu1",
        "5.33.1-0ubuntu1",
        "5.34.1-0ubuntu1",
        "5.35.0-0ubuntu1",
        "5.35.0-0ubuntu2",
        "5.35.0-0ubuntu3",
        "5.35.0-0ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "12.1.6-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@12.1.6-0ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.7.1-0ubuntu3",
        "10.4.0-0ubuntu2",
        "10.5.0-0ubuntu1",
        "11.0.0-0ubuntu1",
        "12.1.0-0ubuntu1",
        "12.1.6-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "12.13.0-0ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@12.13.0-0ubuntu1.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "12.9.1-0ubuntu4",
        "12.11.0-0ubuntu1",
        "12.11.1-0ubuntu1",
        "12.13.0-0ubuntu1",
        "12.13.0-0ubuntu1.1",
        "12.13.0-0ubuntu1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "14.6.0-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@14.6.0-0ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "14.4.1-0ubuntu1",
        "14.6.0-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "17.1.0-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@17.1.0-0ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.1.0-0ubuntu1",
        "17.1.0-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "17.3.0-2ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-oslo.messaging",
        "purl": "pkg:deb/ubuntu/python-oslo.messaging@17.3.0-2ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "17.1.0-0ubuntu1",
        "17.2.0-0ubuntu1",
        "17.3.0-2ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.",
  "id": "UBUNTU-CVE-2026-44393",
  "modified": "2026-06-30T16:21:56Z",
  "published": "2026-06-04T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44393"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-44393"
    },
    {
      "type": "REPORT",
      "url": "https://wiki.openstack.org/wiki/OSSN/OSSN-0096"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/2150316"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-44393"
  ]
}

CVE-2026-44393 (GCVE-0-2026-44393)

Vulnerability from cvelistv5 – Published: 2026-06-04 00:00 – Updated: 2026-08-27 12:04

Summary

Severity

7.4 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-04 17:24 UTC

CWE

n/a
CWE-297 - Improper Validation of Certificate with Host Mismatch
CWE-295 - Improper Certificate Validation

Assigner

mitre mitre root

References

6 references

URL	Tags
https://bugs.launchpad.net/oslo.messaging/+bug/2150316
https://wiki.openstack.org/wiki/OSSN/OSSN-0096
https://access.redhat.com/security/cve/CVE-2026-44393	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2484835	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:54757	vendor-advisoryx_refsource_REDHAT

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat OpenStack Platform 16.2	Unaffected: 0:10.2.4-2.20260710155333.82281a0.el8ost , < * (rpm) cpe:/a:redhat:openstack:16.2::el8
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4
Red Hat	Red Hat OpenStack Platform 17.1	cpe:/a:redhat:openstack:17.1
Red Hat	Red Hat OpenStack Platform 18.0	cpe:/a:redhat:openstack:18.0

Show details on NVD website

JSON

To clipboard

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  "containers": {
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.4,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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            }
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              "content": {
                "id": "CVE-2026-44393",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-04T17:24:03.909681Z",
                "version": "2.0.3"
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              {
                "cweId": "CWE-297",
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                "type": "CWE"
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        "providerMetadata": {
          "dateUpdated": "2026-06-04T17:25:05.825Z",
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        "affected": [
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            "cpes": [
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            "vendor": "Red Hat"
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        ],
        "datePublic": "2026-06-04T00:00:00.000Z",
        "descriptions": [
          {
            "lang": "en",
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          }
        ],
        "metrics": [
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            ],
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          {
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              "x_sadp-csaf-vex"
            ],
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        ],
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          {
            "lang": "en",
            "value": "RHSA-2026:54757: Red Hat OpenStack Platform 16.2"
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            "time": "2026-06-04T16:01:33.285Z",
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          {
            "lang": "en",
            "time": "2026-06-04T00:00:00.000Z",
            "value": "Made public."
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        ],
        "title": "oslo.messaging: openstack: OpenStack oslo.messaging: Man-in-the-middle attack via improper TLS hostname verification",
        "workarounds": [
          {
            "lang": "en",
            "value": "To mitigate the risk of man-in-the-middle attacks, restrict network access to the RabbitMQ message broker. Configure firewall rules to permit inbound connections to the RabbitMQ port (typically 5672 or 5671 for AMQPS) only from authorized hosts and services within the control plane. This operational measure reduces the exposure to attackers attempting to intercept and impersonate the broker."
          }
        ],
        "x_adpType": "supplier",
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    "cna": {
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        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected."
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "description": "n/a",
              "lang": "en",
              "type": "text"
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-04T15:07:22.203Z",
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        {
          "url": "https://bugs.launchpad.net/oslo.messaging/+bug/2150316"
        },
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          "url": "https://wiki.openstack.org/wiki/OSSN/OSSN-0096"
        }
      ]
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  },
  "cveMetadata": {
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    "assignerShortName": "mitre",
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    "datePublished": "2026-06-04T00:00:00.000Z",
    "dateReserved": "2026-05-05T00:00:00.000Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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

ubuntu-cve-2026-44393

Vulnerability from osv_ubuntu

CVE-2026-44393 (GCVE-0-2026-44393)

Tags

Sightings

Nomenclature

Related by attack behaviour