CVE-2026-67419Medium· 6.5▾ TwilightPoC availableRabbitMQ 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 t…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 35.8 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 27.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Exploit / PoC code exists
0.3%
Last analysed / modified upstream
0.3% → 0.4%
7.1 → 6.5
high → medium
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.
rabbitmq_server >= 4.3.0, < 4.3.5Upgrade past the affected range:
rabbitmq_server 4.3.5Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-67413Medium· 6.5RabbitMQ is a messaging and streaming broker
CVE-2026-67421Medium· 6.8RabbitMQ is a messaging and streaming broker
CVE-2026-67420Medium· 6.5RabbitMQ is a messaging and streaming broker
CVE-2026-66078Medium· 5.5RabbitMQ is a messaging and streaming broker
CVE-2026-67241Medium· 6.5RabbitMQ is a messaging and streaming broker
CVE-2026-67242Medium· 5.4RabbitMQ is a messaging and streaming broker