CVE-2026-67407

highpriority · track · 28OT risk · elevatedEPSS 0.003 · 18 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.26% (18th) EPSS

CVSS 7.1 · high

Is it mine?

19 products

Check your exposure

Who says so?

3 sources

osv · cert_bund · nvd

EPSS · scored 2026-10-28

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \ ^ $ . | ? + ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 1.2–7.1

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 4.2

v4.05.1mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/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:Xsecondary · security-advisories@github.com

v4.01.2lowCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N/E:U/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862US

affected products (19)

Products and version ranges known to be affected.

Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Open Source Open Source RabbitMQ <3.13.18< 3.13.18cert_bundDE
Open Source Open Source RabbitMQ <4.0.24< 4.0.24cert_bundDE
Open Source Open Source RabbitMQ <4.1.14< 4.1.14cert_bundDE
Open Source Open Source RabbitMQ <4.2.9< 4.2.9cert_bundDE
Open Source Open Source RabbitMQ <4.3.3< 4.3.3cert_bundDE
Open Source RabbitMQ< 3.13.18cert_bundDE
Open Source RabbitMQ< 4.0.24cert_bundDE
Open Source RabbitMQ< 4.1.14cert_bundDE
Open Source RabbitMQ< 4.2.9cert_bundDE
Open Source RabbitMQ< 4.3.3cert_bundDE
broadcom rabbitmq server4.0.0 → 4.0.23nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.1.0 → 4.1.14nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.2.0 → 4.2.9nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
broadcom rabbitmq server4.3.0 → 4.3.3nvdUScpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
Bitnami rabbitmq4.0.0 → 4.0.23osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.1.0 → 4.1.14osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.2.0 → 4.2.9osvUSpkg:bitnami/rabbitmq
Bitnami rabbitmq4.3.2 → 4.3.3osvUSpkg:bitnami/rabbitmq

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2485RabbitMQ: Mehrere SchwachstellenDeutsch2026-07-22csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in RabbitMQ ausnutzen, um Denial-of-Service-Angriffe durchzuführen, Autorisierungs- und Mandantengrenzen zu umgehen, Daten zu manipulieren oder offenzulegen und Cross Site Scripting Angriffe durchzuführen.
BIT-rabbitmq-2026-67407RabbitMQ: Incomplete fix for CVE-2026-44838: `escape_regex_char/1` does not escape `-`, leaving room for an MQTT topic permission bypass2026-10-01vendor · osvUS
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \ ^ $ . | ? + ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.

also known as (1)

Other names and identifiers for this entity.

GHSA-q46v-hrvq-hp24 osv

sources

Which sources assert this record, and when.

osv cert_bund nvd NVD CVE.org MITRE

published 2026-09-25modified 2026-10-16

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3Release Notes
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q46v-hrvq-hp24Vendor AdvisoryExploitMitigation

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