Information disclosure in Broadcom Rabbitmq Server
CVE-2026-67406
RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3, 4.2.9, 4.1.14, and 4.0.23, Shovel does not format state logged by the crash reporter and can leave unencrypted credentials in a crash dump file. the shovel worker genserver processes does not implement the formatstatus/2 callback. When these processes crash (e.g., due to network partitions, connection failures), the OTP SASL error handler writes the full process state , including plaintext AMQP passwords and URIs , to the error log. This is particularly severe for the shovel worker, which stores deobfuscated plaintext URIs (including amqp://user:password@host format) in its genserver state for the entire process Automatic Credential Exposure: Shovel worker crashes (common during network partitions) automatically write plaintext upstream/downstream passwords to error logs No Special Configuration Needed: Unlike DEBUG logging, SASL error reports are always active Broad. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, and 4.0.23.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Broadcom Rabbitmq Server
- Rabbitmq Rabbitmq-Server — versions >= 4.0.0, < 4.0.23, >= 4.1.0, < 4.1.14, >= 4.2.0, < 4.2.9
Weakness classification (CWE)
References
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q44f-9vc5-grh7 (Exploit, Vendor Advisory)
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 (Release Notes)
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-67406?
- CVE-2026-67406 is a medium-severity vulnerability in Broadcom Rabbitmq Server, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-09-25.
- How severe is CVE-2026-67406?
- Medium severity. CVSS v3 base score is 6.5 out of 10.