Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-67419

CVE-2026-67419HIGH

RabbitMQ: Consecutive topic wildcards cause combinatorial routing work

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   N   N   H    7.1   .0037   29.7     —

AFFECTED
  Product          Versions   Fixed
  rabbitmq-server  < 4.3.5 –  —

TIMELINE
  Jul 29  Reserved by GitHub_M
  Sep 25  Published (CNA: GitHub_M)
  Oct 16  EXPLOIT PUBLISHED — CVE-2026-67419 (rabbitmq-server). Public exploit reference added.

CWE-407, CWE-1333 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 29, 2026	Reserved	Reserved by GitHub_M
September 25, 2026	Published	Published (CNA: GitHub_M)
October 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67419 (rabbitmq-server). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
rabbitmq	rabbitmq-server	—	< 4.3.5	—

Weaknesses

CWE-407 · CWE-1333

References (3)

https://github.com/rabbitmq/rabbitmq-server/commit/c5ed7c4e97e02be688730803604cc7a88dbe4864 [Patch]
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5 [Release Notes]
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-h964-v5mf-22cq [Vendor Advisory, Exploit, Mitigation]

Authoritative record: CVE-2026-67419 at cve.org

Vendors: rabbitmq

Weaknesses: CWE-407 · CWE-1333

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67419 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.