CVE-2026-66067— RabbitMQ: Stream protocol skips per vhost per user connection limits
Quick assessment
Affected
rabbitmq rabbitmq-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
RabbitMQ 是一个消息代理和流式数据处理平台。在 4.2.7 和 4.3.1 版本之前，Stream 的打开处理器仅调用 函数，而忽略了 在处理 AMQP 协议时所执行的节点/虚拟主机/用户连接数限制检查。相关代码行中的开发者注释（%% FIXME）也明确承认了这一遗漏。在连接跟踪机制或其他 RabbitMQ Stream 模块中，均不存在任何补偿性的强制实施措施。因此，经过身份验证的租户可以通过使用端口 5552（Stream 协议默认端口）而非 5672（AMQP 协议默认端口）进行连接，从而完全绕过管理
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I. Basic Information for CVE-2026-66067
Vulnerability Information
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Vulnerability Title
RabbitMQ: Stream protocol skips per vhost per user connection limits
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rabbitmq | rabbitmq-server | >= 4.2.0, < 4.2.7 | - |
|
II. Public POCs for CVE-2026-66067
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-66067 (3)
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Release RabbitMQ 4.3.1 · rabbitmq/rabbitmq-server · GitHub x_refsource_MISC
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Release RabbitMQ 4.2.7 · rabbitmq/rabbitmq-server · GitHub x_refsource_MISC
Same Patch Batch · rabbitmq · 2026-09-23 · 25 CVEs total
| CVE-2026-67404 | 9.2 CRITICAL | RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch |
| CVE-2026-67231 | 9.1 CRITICAL | RabbitMQ: Trust-store whitelist by Issuer+Serial only |
| CVE-2026-66079 | 8.2 HIGH | RabbitMQ: Pre-auth AMQP 1.0 array32 zero-width element DoS |
| CVE-2026-67232 | 8.2 HIGH | RabbitMQ: Web-MQTT decompression bomb |
| CVE-2026-66070 | 7.6 HIGH | RabbitMQ: CORS * reflects Origin with Allow-Credentials |
| CVE-2026-66077 | 7.3 HIGH | RabbitMQ: Stored XSS via TLS peer-certificate DN in management UI |
| CVE-2026-67235 | 7.1 HIGH | RabbitMQ: AMQP 0-9-1 body assembly never validates accumulated size |
| CVE-2026-67238 | 7.1 HIGH | RabbitMQ: Atom-table exhaustion via reply-to queue name decoding |
| CVE-2026-67228 | 6.9 MEDIUM | RabbitMQ: Atom exhaustion: to_atom on runtime-parameter component |
| CVE-2026-67229 | 6.9 MEDIUM | RabbitMQ: Admin-only atom exhaustion: atomize_keys on vhost metadata |
| CVE-2026-67219 | 6.0 MEDIUM | RabbitMQ: Consistent-hash exchange unbounded weight |
| CVE-2026-67220 | 6.0 MEDIUM | RabbitMQ: JMS topic exchange erl_scan atom exhaustion |
| CVE-2026-66074 | 6.0 MEDIUM | RabbitMQ: ReDoS via management API ?name= filter |
| CVE-2026-66072 | 6.0 MEDIUM | RabbitMQ: Atom table exhaustion via stream `chunk_selector` |
| CVE-2026-66080 | 5.9 MEDIUM | RabbitMQ: Super-stream partitions unbounded allocation |
| CVE-2026-67221 | 5.9 MEDIUM | RabbitMQ: AMQP 1.0 shovel status exposes plaintext URI passwords |
| CVE-2026-66068 | 5.6 MEDIUM | RabbitMQ: Shovel DEBUG log of full state exposes decrypted URIs |
| CVE-2026-67405 | 5.3 MEDIUM | RabbitMQ: CSWSH on Web-STOMP / Web-MQTT (no Origin validation) |
| CVE-2026-66069 | 2.3 LOW | RabbitMQ: Monitoring-tag DELETE of auth-attempt metrics |
| CVE-2026-66076 | 2.3 LOW | RabbitMQ: Cross-vhost quorum-queue status and stream tracking disclosure |
Showing top 20 of 25 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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