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CVE-2026-67222

RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client

5.9 MediumFix available

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.32%Unchanged since Sep 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
CVE-2026-67222
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2026-87143 5.9

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
EUVD-2026-87143
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 5.9

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
CVE-2026-67222
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
OSV 5.9

RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
CVE-2026-67222
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-400
Updated
2026-11-02
OSVDEBIAN-CVE-2026-67222 6.5

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
DEBIAN-CVE-2026-67222
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:67552 8.7

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:67552
CVSS 3.1
8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-67222 5.9

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
UBUNTU-CVE-2026-67222
CVSS 4.0
5.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVAZL-105750 No score

CVE-2026-67222 affecting package rabbitmq-server for versions less than 3.13.7-10

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
AZL-105750
Updated
2026-11-05
OSVBIT-rabbitmq-2026-67222 No score

RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15, 4.0.20, 4.1.11, and 4.2.6, mechanisms/1 applied list_to_atom/1 to every colon-delimited token in an attacker-controlled auth_mechanism value, permanently consuming Erlang VM atoms and allowing the node to be crashed with a large request. Exploitation requires the Shovel or Federation plugin to be in use, and setting auth_mechanism requires the policymaker tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Record
BIT-rabbitmq-2026-67222
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
rabbitmq-server
Azure Linux:3
 before 3.13.7-10
3.13.7-10
rabbitmq
Bitnami
 3.13.0 up to 3.13.15, 4.0.0 up to 4.0.20, 4.1.0 up to 4.1.11, 4.2.0 up to 4.2.6
3.13.154.0.204.1.114.2.6
rabbitmq-server
Debian:12
 All versions, plus listed versions
3.10.8-1.13.10.8-1.1+deb12u13.10.8-23.10.8-33.10.8-4
Show 24 moreShow less
3.12.1-13.12.1-1.14.0.5-14.0.5-104.0.5-114.0.5-124.0.5-134.0.5-144.0.5-24.0.5-34.0.5-44.0.5-54.0.5-64.0.5-84.0.5-94.3.0-14.3.0-24.3.0-34.3.2-14.3.2-24.3.2-34.3.2-44.3.2-54.3.6-1
 None known
rabbitmq-server
Debian:13
 All versions, plus listed versions
4.0.5-104.0.5-114.0.5-124.0.5-134.0.5-14
Show 14 moreShow less
4.0.5-64.0.5-6+deb13u14.0.5-6+deb13u24.0.5-84.0.5-94.3.0-14.3.0-24.3.0-34.3.2-14.3.2-24.3.2-34.3.2-44.3.2-54.3.6-1
 None known
rabbitmq-server
Debian:14
 before 4.3.0-2, plus listed versions
4.0.5-104.0.5-114.0.5-124.0.5-134.0.5-14
Show 4 moreShow less
4.0.5-64.0.5-84.0.5-94.3.0-1
4.3.0-2
rabbitmq-server4.3
Red Hat:hummingbird:1
From an advisory covering 54 CVEs
 before 0:4.3.6-1.hum1
0:4.3.6-1.hum1
rabbitmq-server
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
3.5.4-13.5.4-33.5.4-3.13.5.7-13.5.7-1ubuntu0.16.04.1
Show 5 moreShow less
3.5.7-1ubuntu0.16.04.23.5.7-1ubuntu0.16.04.43.5.7-1ubuntu0.16.04.4+esm13.5.7-1ubuntu0.16.04.4+esm23.5.7-1ubuntu0.16.04.4+esm3
 None known
rabbitmq-server
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
3.6.10-13.6.10-1ubuntu0.13.6.10-1ubuntu0.33.6.10-1ubuntu0.43.6.10-1ubuntu0.53.6.10-1ubuntu0.5+esm1
 None known
rabbitmq-server
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.7.8-4ubuntu23.7.18-13.8.2-0ubuntu13.8.2-0ubuntu1.13.8.2-0ubuntu1.2
Show 8 moreShow less
3.8.2-0ubuntu1.33.8.2-0ubuntu1.43.8.2-0ubuntu1.53.8.3-0ubuntu0.13.8.3-0ubuntu0.23.8.3-0ubuntu0.33.8.3-0ubuntu0.3+esm13.8.3-0ubuntu0.3+esm2
 None known
rabbitmq-server
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.8.9-3ubuntu13.9.8-13.9.8-23.9.8-33.9.8-5
Show 8 moreShow less
3.9.8-63.9.13-13.9.13-1ubuntu0.22.04.13.9.13-1ubuntu0.22.04.23.9.27-0ubuntu0.13.9.27-0ubuntu0.23.9.27-0ubuntu0.53.9.27-0ubuntu0.6
 None known
rabbitmq-server
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.12.1-13.12.1-1ubuntu13.12.1-1ubuntu1.23.12.1-1ubuntu1.43.12.1-1ubuntu1.63.12.1-1ubuntu1.7
 None known
rabbitmq-server
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.0.5-8ubuntu24.0.5-10ubuntu14.0.5-10ubuntu24.0.5-10ubuntu34.0.5-10ubuntu44.0.5-10ubuntu54.0.5-10ubuntu5.14.0.5-10ubuntu5.2
 None known

History

History
RecordedChangedSources
affected
factsOSV
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-67222 is a medium vulnerability (CVSS 5.9) in Broadcom Rabbitmq Server, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. Fixed in rabbitmq-server 3.13.7-10.

References

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Left out here: 124 references. The JSON record has them.

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