CVE-2026-67404— RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
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 是一种消息和流式处理代理。在 3.13.15、4.0.20、4.1.11、4.2.6 和 4.3.0 版本之前，当没有可用的 CA 证书包时， 会回退到 ，并且不会发出任何警告。处于中间人攻击位置的攻击者可以伪造 JWKS 响应，从而导致代理接受任意 JWT 令牌。前提条件包括：必须使用 OAuth2 插件且未配置 ，操作系统中的 CA 证书包为空或不可读（例如，在最小化容器环境中），并且攻击者必须处于网络中间人位置。该问题已在版本 3.13.15、4.0.20、4.1.11、4.2.6 和 4.
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I. Basic Information for CVE-2026-67404
Vulnerability Information
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Vulnerability Title
RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
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, When no CA bundle is available, ssl_options/1 falls back to [{verify, verify_none}] with no warning. An attacker in a man-in-the-middle position can forge the JWKS response, which leads the broker to accept arbitrary JWTs. Preconditions include The OAuth2 plugin must be in use with no cacertfile configured and the OS CA bundle empty or unreadable (for example, in a minimal container), and the attacker must hold a network man-in-the-middle position.. 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:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
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-2026-67404
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-67404 (1)
Other References for CVE-2026-67404 (1)
Same Patch Batch · rabbitmq · 2026-09-23 · 25 CVEs total
| 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-2026-66067 | 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-2026-67219 | 6.0 MEDIUM | RabbitMQ: Consistent-hash exchange unbounded weight |
| CVE-2026-66072 | 6.0 MEDIUM | RabbitMQ: Atom table exhaustion via stream `chunk_selector` |
| CVE-2026-67220 | 6.0 MEDIUM | RabbitMQ: JMS topic exchange erl_scan atom exhaustion |
| 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-2026-67240 | 2.3 LOW | RabbitMQ: ReDoS via AMQP 1.0 SQL filter LIKE wildcard |
| CVE-2026-66075 | 2.3 LOW | RabbitMQ: Monitoring-tag user can restart federation links |
Showing top 20 of 25 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: rabbitmq-server
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CVE-2026-67420
RabbitMQ OAuth credential refresh retains revoked runtime ta -
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CVE-2026-67406
RabbitMQ: Federation and Shovel Gen-Servers Lack format_stat
Same vendor: rabbitmq
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RabbitMQ OAuth credential refresh retains revoked runtime ta -
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RabbitMQ: Consecutive topic wildcards cause combinatorial ro -
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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-295
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Failed X509_verify_cert leaves unverified CA in shared CertM -
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Trusted peer certificate match ignores public key, allowing
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