Resource exhaustion in Broadcom Rabbitmq Server
CVE-2026-67238
RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, rabbit_pid_codec:decompose_from_binary/1 parses a caller-supplied ETF-encoded binary and calls binary_to_atom(Node, utf8) on the node-name field. It is reached from rabbit_volatile_queue:pid_from_name/2, which is invoked for any queue name / routing key beginning amq.rabbitmq.reply-to.. The CandidateNodes membership check happens after the atom is created, and the surrounding try/catch cannot reclaim atoms (they are never GC'd). binary_to_existing_atom is not used. Any authenticated AMQP client can crash the entire Erlang VM (all vhosts, all connections) with ~1M cheap requests. Preconditions include Authenticated AMQP 0-9-1 connection to any vhost No per-connection rate limit low enough to make ~1M operations infeasible. This issue is fixed in versions 4.2.7 and 4.3.1.
Vulnerability class: DoS (Denial of Service)
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:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% 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: 0.004 · change: +0.001
Affected products
- Broadcom Rabbitmq Server
- Rabbitmq Rabbitmq-Server — versions >= 4.2.0, < 4.2.7, >= 4.3.0, < 4.3.1
Weakness classification (CWE)
References
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7 (Release Notes)
- github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1 (Release Notes)
- github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x96j-244m-mrr2 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-67238?
- CVE-2026-67238 is a medium-severity vulnerability in Broadcom Rabbitmq Server, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-23.
- How severe is CVE-2026-67238?
- Medium severity. CVSS v3 base score is 6.5 out of 10.