Medium
rabbitmq-server — security advisory
RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.
- 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
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67234
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 17:59 UTC · Revision 1
Source evidence
RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.
osv:UBUNTU-CVE-2026-67234
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": "2e41540a8b3bc8ee9d38dd75416f3d074e323a596b4b14eb5bc709667d6a7c54",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-67234",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-67234",
"summary": "RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.8 and 4.3.2, get_auth_mechanism/1 used term_to_binary/1 on the strict_auth_mechanism or preferred_auth_mechanism atom when clearing the corresponding cookie, producing a non-ASCII cookie name that violates RFC 6265 and can prevent the browser from deleting the preference. The issue is not directly exploitable for code execution or data exfiltration; its security relevance is limited to stale authentication-mechanism preferences persisting across logout and login cycles. This issue is fixed in versions 4.2.8 and 4.3.2.",
"evidence": "osv:UBUNTU-CVE-2026-67234",
"products": [
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.5.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.4-3",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.4-3.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.2",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.4",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.4+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.4+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "3.5.7-1ubuntu0.16.04.4+esm3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.10-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.6.10-1ubuntu0.1",
"evidence": "/affected/1/versions"
},
{
"value": "3.6.10-1ubuntu0.3",
"evidence": "/affected/1/versions"
},
{
"value": "3.6.10-1ubuntu0.4",
"evidence": "/affected/1/versions"
},
{
"value": "3.6.10-1ubuntu0.5",
"evidence": "/affected/1/versions"
},
{
"value": "3.6.10-1ubuntu0.5+esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.7.8-4ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "3.7.18-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1.1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1.2",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1.3",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1.4",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.2-0ubuntu1.5",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.3-0ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.3-0ubuntu0.2",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.3-0ubuntu0.3",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.3-0ubuntu0.3+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.3-0ubuntu0.3+esm2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.8.9-3ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.8-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.8-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.8-3",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.8-5",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.8-6",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.13-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.13-1ubuntu0.22.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.13-1ubuntu0.22.04.2",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.27-0ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.27-0ubuntu0.2",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.27-0ubuntu0.5",
"evidence": "/affected/3/versions"
},
{
"value": "3.9.27-0ubuntu0.6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.12.1-1",
"evidence": "/affected/4/versions"
},
{
"value": "3.12.1-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "3.12.1-1ubuntu1.2",
"evidence": "/affected/4/versions"
},
{
"value": "3.12.1-1ubuntu1.4",
"evidence": "/affected/4/versions"
},
{
"value": "3.12.1-1ubuntu1.6",
"evidence": "/affected/4/versions"
},
{
"value": "3.12.1-1ubuntu1.7",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "rabbitmq-server",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.5-8ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu5",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu5.1",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5-10ubuntu5.2",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-67234",
"aliases": [
"UBUNTU-CVE-2026-67234"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "3.5.7-1ubuntu0.16.04.4+esm3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "3.6.10-1ubuntu0.5+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"3.7.8-4ubuntu2",
"3.7.18-1",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "3.8.3-0ubuntu0.3+esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"3.8.9-3ubuntu1",
"3.9.8-1",
"3.9.8-2",
"3.9.8-3",
"3.9.8-5",
"3.9.8-6",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "3.9.27-0ubuntu0.6"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "3.12.1-1ubuntu1.7"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"4.0.5-8ubuntu2",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67234.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "rabbitmq-server",
"binary_version": "4.0.5-10ubuntu5.2"
}
]
}
}
],
"modified": "2026-10-22T10:30:15.621335031Z",
"provider": "osv",
"upstream": [
"CVE-2026-67234"
],
"references": [
"https://ubuntu.com/security/CVE-2026-67234",
"https://www.cve.org/CVERecord?id=CVE-2026-67234",
"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q286-p3m9-j69f",
"https://github.com/rabbitmq/rabbitmq-server/commit/149cb59d618cefa83c6deb02dbbb1e8a7a2bc968",
"https://github.com/rabbitmq/rabbitmq-server/commit/baac0aaf170efeb4f124ee36b8417274fa8dcc1a",
"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.8",
"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.2"
]
},
"related_cves": [
{
"value": "CVE-2026-67234",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 405407,
"published_at": "2026-09-25T17:17:00+00:00"
}