CVE-2026-67419
mediumRabbitMQ is a messaging and streaming broker.
Vendor / product: Broadcom — rabbitmq server
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
6.5
6.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-25 17:17
Modified: 2026-10-16 15:46
NVD status: Analyzed
Last synced 3 days ago
Verified against the source API 2026-10-27 06:55 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
broadcom / rabbitmq_server ≥4.3.0 <4.3.5
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq
Vendor advisory: https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq
Patch / mitigation: https://github.com/rabbitmq/rabbitmq-server/commit/c5ed7c4e97e02be688730803604cc7a88dbe4864
References
- https://github.com/rabbitmq/rabbitmq-server/commit/c5ed7c4e97e02be688730803604cc7a88dbe486... security-advisories@github.com
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5 security-advisories@github.com
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq security-advisories@github.com
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:55 UTC · record ↗