CVE-2026-67419
mediumpriority · track · 26EPSS 0.004 · 31 %ileDEUSEPSS · scored 2026-10-27
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (13)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2881RabbitMQ: Mehrere SchwachstellenDeutsch2026-08-17csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in RabbitMQ ausnutzen, um Berechtigungen zu erweitern, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren, beliebigen Code auszuführen oder Denial-of-Service-Zustände herbeizuführen.
- BIT-rabbitmq-2026-67419RabbitMQ: Consecutive topic wildcards cause combinatorial routing work2026-10-01vendor · osvUS
RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.
also known as (1)
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sources
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references (3) nvd
External citations — patches, advisories, analysis.
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