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PatchSiren cyber security CVE debrief

CVE-2026-57221 rabbitmq CVE debrief

CVE-2026-57221 is a RabbitMQ vulnerability allowing enumeration of queue and exchange names and reading of queue message and consumer counts due to lack of authorization checks on passive queue.declare and exchange.declare AMQP 0-9-1 operations. This issue affects RabbitMQ versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6. Users of these versions should apply patches to prevent queue and exchange enumeration. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity. The CVE record was published on 2026-07-10T21:16:59.327Z and has not been modified since then.

Vendor
rabbitmq
Product
rabbitmq-server
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-10
Original CVE updated
2026-07-13
Advisory published
2026-07-10
Advisory updated
2026-07-13

Who should care

Users of RabbitMQ versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6 should apply patches to prevent queue and exchange enumeration. This includes RabbitMQ operators, administrators, and security teams responsible for managing and securing RabbitMQ deployments. Additionally, security teams and vulnerability management teams should review the CVE record and official advisory to validate affected scope, severity, and vendor guidance.

Technical summary

RabbitMQ is vulnerable to enumeration of queue and exchange names and reading of queue message and consumer counts due to lack of authorization checks on passive queue.declare and exchange.declare AMQP 0-9-1 operations. This vulnerability affects RabbitMQ versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6. The issue can be fixed by applying patches to the affected versions. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity.

Defensive priority

Medium priority due to CVSS score of 5.3 and potential for information disclosure.

Recommended defensive actions

  • Apply patches to RabbitMQ versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6
  • Restrict access to RabbitMQ virtual hosts
  • Monitor RabbitMQ logs for suspicious activity
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

Evidence is based on official CVE and NVD records, as well as source references from GitHub. The CVE record was published on 2026-07-10T21:16:59.327Z and has not been modified since then. The GitHub commits and pull requests provide additional context on the vulnerability fix. However, the exact scope of affected deployments and potential impact on managed environments is not explicitly stated in the available sources. Defenders should verify the affected scope and severity based on the official advisory and CVE record.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-57221 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-57221

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-57221 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-57221

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.