CVE-2026-57216Public exploitNetwork attack vector

Remote restricted-user sessions via sockname confusion

Published Jul 10, 2026 · Updated Jul 10, 2026

Improper authentication in RabbitMQ Server before 3.13.15, 4.0.20, 4.1.11, or 4.2.6 allows remote attackers to open loopback-restricted sessions. The affected protocol paths give the accepted socket to the loopback gate, whose is_loopback helper reads the listener-side sockname rather than the client peer address. Exploitation requires valid restricted-user credentials, a trusted PROXY-protocol frontend, and a loopback-bound listener; the demonstrated result is a live session with that user's existing permissions.

CVSS severity6.8
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in RabbitMQ Server before 3.13.15, 4.0.20, 4.1.11, or 4.2.6 allows remote attackers to open loopback-restricted sessions. The affected protocol paths give the accepted socket to the loopback gate, whose is_loopback helper reads the listener-side sockname rather than the client peer address. Exploitation requires valid restricted-user credentials, a trusted PROXY-protocol frontend, and a loopback-bound listener; the demonstrated result is a live session with that user's existing permissions.

The record

CVE
CVE-2026-57216
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-287, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.13.0, < 3.13.15
  2. Affected versionversion=>= 4.0.0, < 4.0.21
  3. Affected versionversion=>= 4.1.0, < 4.1.11
  4. Affected versionversion=>= 4.2.0, < 4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.15; version=>= 4.0.0, < 4.0.21; version=>= 4.1.0, < 4.1.11; version=>= 4.2.0, < 4.2.6

Published CVSS scores

6.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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