Vulnerability Details CVE-2026-67223
RabbitMQ is a messaging and streaming broker. The advisory establishes affected 3.13, 4.0, 4.1, 4.2, and 4.3 maintenance lines but contains conflicting first-fixed versions for the 3.13, 4.0, and 4.1 lines. fill/2 substitutes ${username} into user_dn_pattern without RFC 4514 DN escaping, allowing a crafted username to alter the LDAP bind DN and potentially select a different directory entry. Exploitation requires rabbitmq_auth_backend_ldap with a user_dn_pattern containing ${username}, a directory layout in which the injected suffix resolves usefully, and a password valid for the resulting DN. The advisory body identifies 3.13.15, 4.0.20, 4.1.11, 4.2.9, and 4.3.3 as fixed, while structured metadata identifies 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3. No fixed-version assertion is certifiable until a curator resolves this conflict.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 27.0%
CVSS Severity
CVSS v3 Score 7.1
References
- https://github.com/rabbitmq/rabbitmq-server/commit/ad3ca47accd313a4a0dbcbbe17bf60fc8f4b2614
- https://github.com/rabbitmq/rabbitmq-server/commit/b54056e59b7fd3a2d7f07dfaba95f026e138eee8
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-9x7r-g78c-5835
Products affected by CVE-2026-67223
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.0
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.1
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.15
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.2
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.3
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.4
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.5
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.6
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.7
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cpe:2.3:a:broadcom:rabbitmq_server:3.13.9
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.0
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.1
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.13
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.2
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.20
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.22
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.3
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.4
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.5
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.6
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.7
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.8
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cpe:2.3:a:broadcom:rabbitmq_server:4.0.9
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.0
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.1
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.11
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.2
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.3
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.4
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.5
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.6
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.7
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cpe:2.3:a:broadcom:rabbitmq_server:4.1.8
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cpe:2.3:a:broadcom:rabbitmq_server:4.3.0
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cpe:2.3:a:broadcom:rabbitmq_server:4.3.1
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cpe:2.3:a:broadcom:rabbitmq_server:4.3.2