CVE-2026-67226— RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
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 是一个消息和流式处理代理。在 4.0.0 至 4.0.21、4.1.0 至 4.1.13 以及 4.2.0 至 4.2.6 版本中存在一个管理界面相关的原子耗尽漏洞：当通过 PUT /api/users/tags 列表接口设置用户标签时，系统会将 函数作用于用户的标签列表上。由于管理界面的请求体大小限制为 20MB，大约可以容纳 300 万到 400 万个短标签字符串。攻击者（或具有管理员权限的用户）可以通过创建用户（或导入定义）的方式，为每个用户分配约 100 万个唯一的标签，从而在单次请求中导
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I. Basic Information for CVE-2026-67226
Vulnerability Information
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Vulnerability Title
RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rabbitmq | rabbitmq-server | >= 4.0.0, < 4.0.22 | - |
|
II. Public POCs for CVE-2026-67226
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-67226 (3)
-
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7 x_refsource_MISC
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-2026-61837 | 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-2026-67223 | 6.3 MEDIUM | RabbitMQ: LDAP DN injection via unescaped substitution |
| CVE-2026-67225 | 6.3 MEDIUM | RabbitMQ: Stream-protocol frame length never validated against frame_max |
| CVE-2026-66071 | 6.0 MEDIUM | RabbitMQ: Atom exhaustion: OAuth2 JWT tag: scope values |
| CVE-2026-67413 | 6.0 MEDIUM | RabbitMQ: Authenticated RabbitMQ JMS Topic Selector Users Can Consume Broker CPU with an U |
| CVE-2026-67412 | 6.0 MEDIUM | RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message acces |
| CVE-2026-66073 | 6.0 MEDIUM | RabbitMQ: Atom table exhaustion via management API node field |
| CVE-2026-67411 | 6.0 MEDIUM | RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass |
| 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 |
| CVE-2026-67415 | 5.9 MEDIUM | RabbitMQ: Shovel Management Atom Exhaustion Allows Persistent Broker-Wide Denial of Servic |
Showing top 20 of 28 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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