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CVE-2026-67223— RabbitMQ: LDAP DN injection via unescaped substitution

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 是一种消息与流式处理代理（broker）。该安全公告确定了受影响的 3.13、4.0、4.1、4.2 和 4.3 维护分支，但其中关于 3.13、4.0 和 4.1 分支的首次修复版本存在冲突。 在 函数中， 被插入到 中时，未遵循 RFC 4514 对 DN（Distinguished Name，可分辨名称）的转义规范。这使得攻击者可以通过构造特定的用户名来篡改 LDAP 绑定 DN，从而可能选择到不同的目录条目。 成功利用该漏洞需要满足以下条件： 启用了 认证后端； 中包含 ； LDAP 目录

CVSS 6.3 · Medium EPSS 0.35% · P26
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I. Basic Information for CVE-2026-67223

Vulnerability Information
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Vulnerability Title
RabbitMQ: LDAP DN injection via unescaped substitution
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. The advisory establishes affected 3.13, 4.0, 4.1, 4.2, and 4.3 maintenance lines but contains conflicting first-fixed versions for the 3.13, 4.0, and 4.1 lines. fill/2 substitutes ${username} into user_dn_pattern without RFC 4514 DN escaping, allowing a crafted username to alter the LDAP bind DN and potentially select a different directory entry. Exploitation requires rabbitmq_auth_backend_ldap with a user_dn_pattern containing ${username}, a directory layout in which the injected suffix resolves usefully, and a password valid for the resulting DN. The advisory body identifies 3.13.15, 4.0.20, 4.1.11, 4.2.9, and 4.3.3 as fixed, while structured metadata identifies 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3. No fixed-version assertion is certifiable until a curator resolves this conflict.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rabbitmq rabbitmq-server >= 3.13.0, < 3.13.18 -

II. Public POCs for CVE-2026-67223

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III. Intelligence Information for CVE-2026-67223

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Other References for CVE-2026-67223 (5)

Same Patch Batch · rabbitmq · 2026-09-25 · 28 CVEs total

CVE-2026-67236 8.2 HIGH RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /
CVE-2026-67409 8.2 HIGH RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Au
CVE-2026-67410 8.2 HIGH RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint
CVE-2026-67239 7.6 HIGH RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI
CVE-2026-67237 7.5 HIGH RabbitMQ: Reflected XSS via the OAuth bootstrap JS endpoint
CVE-2026-67408 7.1 HIGH RabbitMQ: Stream Management Super-Stream Binding Keys Allocation Allows Low-Privilege Node
CVE-2026-67419 7.1 HIGH RabbitMQ: Consecutive topic wildcards cause combinatorial routing work
CVE-2026-67226 6.9 MEDIUM RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
CVE-2026-61837 6.3 MEDIUM RabbitMQ: AMQP 1.0 management `GET /bindings` exposes full binding topology to any authent
CVE-2026-67242 6.3 MEDIUM RabbitMQ: OAuth2 is_integer(Exp) guard skips token-expiry checks for float exp
CVE-2026-67230 6.3 MEDIUM RabbitMQ: Web-STOMP unbounded pre-auth accumulation
CVE-2026-67225 6.3 MEDIUM RabbitMQ: Stream-protocol frame length never validated against frame_max
CVE-2026-67411 6.0 MEDIUM RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass
CVE-2026-66073 6.0 MEDIUM RabbitMQ: Atom table exhaustion via management API node field
CVE-2026-67412 6.0 MEDIUM RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message acces
CVE-2026-67413 6.0 MEDIUM RabbitMQ: Authenticated RabbitMQ JMS Topic Selector Users Can Consume Broker CPU with an U
CVE-2026-66071 6.0 MEDIUM RabbitMQ: Atom exhaustion: OAuth2 JWT tag: scope values
CVE-2026-67415 5.9 MEDIUM RabbitMQ: Shovel Management Atom Exhaustion Allows Persistent Broker-Wide Denial of Servic
CVE-2026-67222 5.9 MEDIUM RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client
CVE-2026-67227 5.9 MEDIUM RabbitMQ: Atom exhaustion: to_atom on global-parameter :name

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: rabbitmq-server
Same vendor: rabbitmq
Same weakness: CWE-90

V. Comments for CVE-2026-67223

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