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Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

CVE-2026-67220RabbitMQ: JMS topic exchange erl_scan atom exhaustion

Medium 6.0

In plain English

A medium-severity uncontrolled resource consumption in rabbitmq-server from rabbitmq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium
Exploit odds (30 days)0.3%top 75.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.0, When a binding is created on an x-jms-topic exchange, add_binding/3 reads the rjms_erlang_selector argument and passes it through erl_scan:string/1 then erl_parse:parse_term/1. erl_scan:string/1 interns every atom literal it tokenizes. validate_binding/2 is a no-op (-> ok.), there is no length cap, and the surrounding try/catch cannot reclaim atoms. The Java JMS client compiles selectors client-side, but the server does not enforce this , a raw AMQP client can send arbitrary selector strings. An authenticated low-privilege AMQP user confined to one vhost can crash the entire broker node (cross-tenant DoS) in <100 bind calls. Preconditions include rabbitmq_jms_topic_exchange plugin enabled (bundled; required for any JMS deployment) Authenticated AMQP user with read on an x-jms-topic exchange + write on a queue (or configure to declare both). This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rabbitmq-serverno fix listedDEBIAN-CVE-2026-67220
Debian:13rabbitmq-serverno fix listedDEBIAN-CVE-2026-67220
Debian:14rabbitmq-server4.3.0-2DEBIAN-CVE-2026-67220
Ubuntu:22.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-67220
Ubuntu:24.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-67220
Ubuntu:26.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-67220

Affected products (as reported)

VendorProductVersions
rabbitmq rabbitmq-server >= 3.13.0, < 3.13.15>= 4.0.0, < 4.0.20>= 4.1.0, < 4.1.11>= 4.2.0, < 4.2.6

Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References