High
rabbitmq-server — security advisory
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.
- Products
- rabbitmq-server
- Affected versions
- 3.12.1-1, 3.12.1-1ubuntu1, 3.12.1-1ubuntu1.2, 3.12.1-1ubuntu1.4, 3.12.1-1ubuntu1.6, 3.12.1-1ubuntu1.7, 3.5.4-1, 3.5.4-3, 3.5.4-3.1, 3.5.7-1, 3.5.7-1ubuntu0.16.04.1, 3.5.7-1ubuntu0.16.04.2, 3.5.7-1ubuntu0.16.04.4, 3.5.7-1ubuntu0.16.04.4+esm1, 3.5.7-1ubuntu0.16.04.4+esm2, 3.5.7-1ubuntu0.16.04.4+esm3, 3.6.10-1, 3.6.10-1ubuntu0.1, 3.6.10-1ubuntu0.3, 3.6.10-1ubuntu0.4, 3.6.10-1ubuntu0.5, 3.6.10-1ubuntu0.5+esm1, 3.7.18-1, 3.7.8-4ubuntu2, 3.8.2-0ubuntu1, 3.8.2-0ubuntu1.1, 3.8.2-0ubuntu1.2, 3.8.2-0ubuntu1.3, 3.8.2-0ubuntu1.4, 3.8.2-0ubuntu1.5, 3.8.3-0ubuntu0.1, 3.8.3-0ubuntu0.2, 3.8.3-0ubuntu0.3, 3.8.3-0ubuntu0.3+esm1, 3.8.3-0ubuntu0.3+esm2, 3.8.9-3ubuntu1, 3.9.13-1, 3.9.13-1ubuntu0.22.04.1, 3.9.13-1ubuntu0.22.04.2, 3.9.27-0ubuntu0.1, 3.9.27-0ubuntu0.2, 3.9.27-0ubuntu0.5, 3.9.27-0ubuntu0.6, 3.9.8-1, 3.9.8-2, 3.9.8-3, 3.9.8-5, 3.9.8-6, 4.0.5-10ubuntu1, 4.0.5-10ubuntu2, 4.0.5-10ubuntu3, 4.0.5-10ubuntu4, 4.0.5-10ubuntu5, 4.0.5-10ubuntu5.1, 4.0.5-10ubuntu5.2, 4.0.5-8ubuntu2, 4.3.2-4ubuntu2, 4.3.2-4ubuntu3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67411
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:13 UTC · Revision 1
Source evidence
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.
osv:UBUNTU-CVE-2026-67411
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
Complete source record
{
"id": "ec8b3f3d6c5959036bc572031a5c0ae19994cf14f770162ec1572f34a7543e68",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-67411",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-67411",
"summary": "RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.",
"evidence": "osv:UBUNTU-CVE-2026-67411",
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{
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{
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{
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{
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"type": "CVSS_V3",
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},
{
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],
"modified": "2026-10-17T13:00:36.136529085Z",
"provider": "osv",
"upstream": [
"CVE-2026-67411"
],
"references": [
"https://ubuntu.com/security/CVE-2026-67411",
"https://www.cve.org/CVERecord?id=CVE-2026-67411",
"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6",
"https://github.com/rabbitmq/rabbitmq-server/commit/a7528314840c4f8dc9904684f9f97ffa7aac6349",
"https://github.com/rabbitmq/rabbitmq-server/commit/edbead0eabbd65925d0dc914a22d6a29e155e646",
"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9",
"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3"
]
},
"related_cves": [
{
"value": "CVE-2026-67411",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360725,
"published_at": "2026-09-25T17:17:00+00:00"
}