Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106121RabbitMQ: JSONReader in the default JSON-RPC mapper never terminates on truncated input, causing DoS

Medium 4.9

In plain English

A medium-severity infinite loop in amqp-client from com.rabbitmq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.9Medium

Exploit odds (30 days)0.5%top 54.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.37.0, com.rabbitmq.tools.json.JSONReader.read() fails to terminate when input ends inside a quoted string or a line comment because its string and whitespace scanners do not stop at CharacterIterator.DONE. The default DefaultJsonRpcMapper passes JSON-RPC message bodies to this parser for JsonRpcServer and client replies. A truncated string causes the parser to append replacement end markers until heap exhaustion, while a line comment without a terminating newline can keep a thread consuming CPU indefinitely, resulting in denial of service. This issue is fixed in version 5.37.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	rabbitmq-java-client	no fix listed	DEBIAN-CVE-2026-106121
Debian:13	rabbitmq-java-client	no fix listed	DEBIAN-CVE-2026-106121
Maven	com.rabbitmq:amqp-client	5.36.1	GHSA-cqgh-8p3p-mx4m
Ubuntu:22.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-106121
Ubuntu:24.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-106121
Ubuntu:26.04:LTS	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-106121
Ubuntu:26.10	rabbitmq-java-client	no fix listed	UBUNTU-CVE-2026-106121

Affected products (as reported)

Vendor	Product	Versions
rabbitmq	rabbitmq-java-client	< 5.36.1
com.rabbitmq	amqp-client	< 5.36.1

Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-cqgh-8p3p-mx4m x_refsource_CONFIRM
https://github.com/rabbitmq/rabbitmq-java-client/pull/2100 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/commit/25fad817291feff3195c32620117d295598f8b41 x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.37.0 x_refsource_MISC