Review reviewCritical

CVE-2026-57211

rabbitmq rabbitmq-server, rabbitmq server, windows

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.

CVSS: 10
EPSS: 0.40%
CISA KEV: Not listed
Published: 2026.07.11

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.40%

Technical severityCVSS 10

Vulnerability overview

Affected product and versions

Product: rabbitmq rabbitmq-server, rabbitmq server, windows
Affected versions: >= >= 4.2.0, < 4.2.6, >= >= 4.1.0, < 4.1.11, >= 4.1.0 < 4.2.6
Fixed versions: 4.2.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that rabbitmq rabbitmq-server, rabbitmq server, windows and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE: CWE-36, CWE-918