CVE-2026-67232— RabbitMQ: Web-MQTT decompression bomb
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 是一种消息和流式传输代理。在版本 3.13.15、4.0.20、4.1.11、4.2.6 和 4.3.0 之前，Cowboy WebSocket 选项在第 117 行设置了 compress => true，从而启用了 RFC 7692 定义的 permessage-deflate 协商机制。由于处理程序未设置 max_frame_size，因此应用了 Cowboy 默认的无穷大值。cowlib 的 cow_ws:parse_payload/9 函数对压缩有效载荷调用 zlib:inflate/2
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I. Basic Information for CVE-2026-67232
Vulnerability Information
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Vulnerability Title
RabbitMQ: Web-MQTT decompression bomb
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, The cowboy WebSocket options at line 117 set compress => true, enabling RFC 7692 permessage-deflate negotiation. The handler does not set max_frame_size, so cowboy's default of infinity applies. cowlib's cow_ws:parse_payload/9 calls zlib:inflate/2 on the compressed payload with no output-size limit. An attacker can negotiate permessage-deflate during the WebSocket upgrade and send a frame containing a zlib bomb (e.g. 50 KB → 5 GB). Decompression occurs in the connection process before websocket_handle/2 ever sees the MQTT bytes. An unauthenticated attacker can crash a RabbitMQ node running the Web-MQTT plugin by sending a single highly-compressed WebSocket frame (a few KB on the wire) that inflates to gigabytes in memory. The cowboy WebSocket handler decompresses the entire frame before the MQTT CONNECT packet is processed, so no credentials are required. Preconditions include rabbitmq_web_mqtt plugin enabled (not default, but common for browser clients) Network reachability to port 15675/15676 No authentication required. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rabbitmq | rabbitmq-server | >= 3.13.0, < 3.13.15 | - |
|
II. Public POCs for CVE-2026-67232
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-67232 (1)
Other References for CVE-2026-67232 (2)
-
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0 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-2026-66070 | 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-2026-66067 | 6.0 MEDIUM | RabbitMQ: Stream protocol skips per vhost per user connection limits |
| 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
Same product: rabbitmq-server
-
CVE-2026-67420
RabbitMQ OAuth credential refresh retains revoked runtime ta -
CVE-2026-67419
RabbitMQ: Consecutive topic wildcards cause combinatorial ro -
CVE-2026-67421
RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth -
CVE-2026-67408
RabbitMQ: Stream Management Super-Stream Binding Keys Alloca -
CVE-2026-67406
RabbitMQ: Federation and Shovel Gen-Servers Lack format_stat
Same vendor: rabbitmq
-
CVE-2026-67420
RabbitMQ OAuth credential refresh retains revoked runtime ta -
CVE-2026-67419
RabbitMQ: Consecutive topic wildcards cause combinatorial ro -
CVE-2026-67421
RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth -
CVE-2026-67408
RabbitMQ: Stream Management Super-Stream Binding Keys Alloca -
CVE-2026-67406
RabbitMQ: Federation and Shovel Gen-Servers Lack format_stat
Same weakness: CWE-409
-
CVE-2026-92573
Apache Qpid Broker-J: Uncontrolled resource consumption duri -
CVE-2026-83599
Netdata: WebSocket Decompression Bomb -
CVE-2026-77620
Vector: Unauthenticated denial of service in the `logstash` -
CVE-2026-77021
Missing decompression size limit in agent receiver allows me -
CVE-2026-47321
Apache MINA: Unbounded Decompression Amplification DoS in Zl
V. Comments for CVE-2026-67232
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