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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-57220] Denial of Service via oversized stream frames

This high-severity Red Hat Linux advisory covers CVE-2026-57220 affecting Red Hat Hardened Images.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-57220 Source published Source updated

VulniPulse record published Record updated

CVE-2026-57220
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

RabbitMQ is a messaging and streaming broker. This issue is fixed in version 4.2.6.

A flaw was found in RabbitMQ. The stream listener in RabbitMQ does not properly enforce frame-size limits during authentication and before negotiation.

This allows an unauthenticated remote client to send oversized stream frames, which can consume excessive broker memory. This can lead to a denial of service (DoS) condition, making the service unavailable to legitimate users.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.

Affected Red Hat products: Red Hat Hardened Images. Red Hat lists Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0 as not affected.

Red Hat fixing advisory: RHSA-2026:35939, RHSA-2026:35940.

Is CVE-2026-57220 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-57220 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-57220?

Upgrade to a fixed release named by Red Hat:

  • 4.2.6
  • rabbitmq-server4-3-main-4.3.2-1.hum1
  • rabbitmq-server4-2-main-4.2.8-1.hum1
  • RHSA-2026:35939
  • RHSA-2026:35940

Confirm against the vendor advisory before you patch.

Affected versions
  • < 4.2.6

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Fixed versions
  • 4.2.6
  • rabbitmq-server4-3-main-4.3.2-1.hum1
  • rabbitmq-server4-2-main-4.2.8-1.hum1
  • RHSA-2026:35939
  • RHSA-2026:35940

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Mitigation

Upgrade to a fixed release: 4.2.6, rabbitmq-server4-3-main-4.3.2-1.hum1, rabbitmq-server4-2-main-4.2.8-1.hum1, RHSA-2026:35939, RHSA-2026:35940. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

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