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Advisory severityCritical10.0Red Hat Linux

Critical [CVE-2026-57211] Information disclosure via path validation bypass in management plugin

This critical-severity Red Hat Linux advisory covers CVE-2026-57211 affecting Red Hat Hardened Images.

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

CVE-2026-57211 Source published Source updated

VulniPulse record published Record updated

CVE-2026-57211
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

RabbitMQ is a messaging and streaming broker.

Prior to 4.1.11 and 4.2.6 on Windows, the RabbitMQ management plugin static file handler rabbit_mgmt_wm_static can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path validation when multiple management extension plugins are enabled, causing outbound DNS and SMB requests to attacker-controlled UNC paths.

This issue is fixed in versions 4.1.11 and 4.2.6. A flaw was found in RabbitMQ.

This can lead to outbound DNS and Server Message Block (SMB) requests to attacker-controlled network paths, potentially disclosing sensitive information. Red Hat severity: Critical — CVSS 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Weakness: CWE-76. 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-2026-57211 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-57211 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-2026-57211?

Upgrade to a fixed release named by Red Hat:

  • 4.1.11
  • 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
  • < 4.1.11
  • < 4.2.6

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

Fixed versions
  • 4.1.11
  • 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: 4.1.11, 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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