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Medium, CVSS 6.3amended

RabbitMQ Java client malformed body frame triggers raw command assembler exception

CVE-2026-63335GHSA-qx7j-jv8m-fppr

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (com.rabbitmq:amqp-client 5.31.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H · score source
EPSS
  • CVE-2026-63335: 0.52% estimated exploitation activity in the next 30 days; percentile 43.94 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary RabbitMQ Java Client's inbound AMQP command assembly accepts a content header declaring a small body and then processes a larger body frame by throwing a raw UnsupportedOperationException from CommandAssembler. A broker peer that the client has connected to can use this malformed frame sequence to fail frame processing and tear down the client connection instead of receiving a clean protocol-level malformed-frame error. This was discovered based on an existing vulnerability CVE-2017-15699. Details Inbound frames enter the client through SocketFrameHandler.readFrame, which returns frames parsed from the peer-controlled input stream (src/main/java/com/rabbitmq/client/impl/SocketFrameHandler.java:197). AMQConnection.MainLoop reads each frame (src/main/java/com/rabbitmq/client/impl/AMQConnection.java:692) and dispatches non-zero-channel frames to the channel while the connection is open (src/main/java/com/rabbitmq/client/impl/AMQConnection.java:748 and…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-qx7j-jv8m-fppr

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-qx7j-jv8m-fppr

Agent brief

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# Patch Next advisory brief: CVE-2026-63335

Advisory: RabbitMQ Java client malformed body frame triggers raw command assembler exception
IDs: CVE-2026-63335, GHSA-qx7j-jv8m-fppr
Record: https://patchnext.com/advisories/cve-2026-63335 (revision 3, source checked 26 Oct 2026, 16:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: com.rabbitmq:amqp-client 5.31.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.rabbitmq:amqp-client: affected <= 5.30.0; fixed in 5.31.0

## Suggested inspection (read-only)
- Maven com.rabbitmq:amqp-client: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.rabbitmq:amqp-client.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-qx7j-jv8m-fppr (OSV record GHSA-qx7j-jv8m-fppr lists affected ranges: Maven com.rabbitmq:amqp-client >=0 <5.31.0 (fixed))
- Verified: https://github.com/advisories/GHSA-qx7j-jv8m-fppr (GitHub-reviewed advisory GHSA-qx7j-jv8m-fppr lists affected ranges: Maven com.rabbitmq:amqp-client >=0 <=5.30.0)

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