Detections
Analytics

RabbitMQ 4.0.x < 4.0.22 / 4.1.x < 4.1.14 / 4.2.x < 4.2.7 Atom Exhaustion via User Tags List

medium Nessus Plugin ID 362547

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Synopsis

The RabbitMQ installed on the remote host is affected by a denial of service vulnerability.

Description

The version of RabbitMQ installed on the remote host is 4.0.x prior to 4.0.22, or 4.1.x prior to 4.1.14, or 4.2.x prior to 4.2.7. It is, therefore, affected by a denial of service vulnerability:

 - set_tags/2 maps rabbit_data_coercion:to_atom/1 over the user's tags list, and the 20 MB management request body limit fits several million short tag strings. An administrator can crash the node in a single request by creating a user, or importing definitions, with approximately one million unique tag strings. (CVE-2026-67226)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to RabbitMQ version 4.0.22, 4.1.14, 4.2.7, or later.

See Also

http://www.nessus.org/u?98b16606

Plugin Details

Severity: Medium

ID: 362547

File Name: rabbitmq_user_tags_atom_4_0_22.nasl

Version: 1.4

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/2/2026

Updated: 10/22/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.7

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: CVSS2#AV:N/AC:L/Au:M/C:N/I:N/A:C

CVSS Score Source: CVE-2026-67226

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.3

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:pivotal_software:rabbitmq, cpe:/a:vmware:rabbitmq

Required KB Items: Settings/ParanoidReport, installed_sw/RabbitMQ

Exploit Ease: No known exploits are available

Patch Publication Date: 7/23/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-67226

IAVA: 2026-A-1075