CVE-2026-67419: high-severity vulnerability in rabbitmq-server
RabbitMQ: Consecutive topic wildcards cause combinatorial routing work
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.4%
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
rabbitmq · rabbitmq-serverRelated CVEs — rabbitmq-server
In the same product, most dangerous first.
CVE-2026-57219HIGHRabbitMQ: Unauthenticated disclosure of OAuth client credentials via an HTTP API endpoint with certain less common OAuth 2 configurationsEPSS 2.8%CVE-2021-32718LOWImproper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in RabbitMQ management UIEPSS 1.4%CVE-2021-32719LOWImproper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in RabbitMQ federation management pluginEPSS 1.4%CVE-2023-46118MEDIUMDenial of Service by publishing large messages over the HTTP APIEPSS 1.3%CVE-2026-67414MEDIUMRabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregationEPSS 0.6%CVE-2026-57211MEDIUMRabbitMQ: UNC SSRF affecting the management UI on WindowsEPSS 0.6%