Vulnerability-Lookup

CVE-2026-63335 (GCVE-0-2026-63335)

Vulnerability from cvelistv5 – Published: 2026-08-18 16:20 – Updated: 2026-08-18 17:43

Title

RabbitMQ Java client malformed body frame triggers raw command assembler exception

Summary

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.31.0, inbound AMQP command assembly in src/main/java/com/rabbitmq/client/impl/CommandAssembler.java processes a content-bearing method and header whose remainingBodyBytes value is smaller than a following AMQP.FRAME_BODY payload. CommandAssembler.consumeBodyFrame subtracts the peer-controlled payload length before validating that it fits, drives remainingBodyBytes negative, and throws a raw UnsupportedOperationException instead of MalformedFrameException. A malicious or compromised broker peer can send this malformed sequence on an open nonzero channel to terminate frame processing and close the client connection, causing denial of service for work using that connection. This issue is fixed in version 5.31.0.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 17:43 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_CONFIRM
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_MISC
https://github.com/rabbitmq/rabbitmq-java-client/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
rabbitmq	rabbitmq-java-client	Affected: < 5.31.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-63335

Vulnerability from fkie_nvd - Published: 2026-08-18 17:17 - Updated: 2026-08-18 18:19

Severity

6.3 (Medium) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/commit/31735344d9f9dfc53740b67f06e560e8846b9322
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/commit/abd6d60d4e2bfc1a327dc90ab246b2e8aca1f33b
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/pull/1959
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/pull/1960
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.31.0
	security-advisories@github.com	https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-QX7J-JV8M-FPPR

Vulnerability from github – Published: 2026-08-18 16:32 – Updated: 2026-08-18 16:32

Summary

RabbitMQ Java client malformed body frame triggers raw command assembler exception

Details

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 src/main/java/com/rabbitmq/client/impl/AMQConnection.java:766). The channel then passes the frame to the current command assembler through AMQChannel.handleFrame and AMQCommand.handleFrame (src/main/java/com/rabbitmq/client/impl/AMQChannel.java:121, src/main/java/com/rabbitmq/client/impl/AMQCommand.java:114). When a content-bearing method is followed by a content header, CommandAssembler.consumeHeaderFrame records the header's declared body size in remainingBodyBytes after only checking it against the configured maximum (src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:126 through src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:139). The body-frame path subtracts the received payload length from that remaining count before validating that the payload fits (src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:145 through src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:149), so a body frame larger than the declared size drives the count negative and reaches the raw UnsupportedOperationException at src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:150 and src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:151. AMQConnection catches the resulting throwable in frame processing and performs connection failure handling and final shutdown (src/main/java/com/rabbitmq/client/impl/AMQConnection.java:695 through src/main/java/com/rabbitmq/client/impl/AMQConnection.java:705).

PoC

poc.zip

bash ./poc/run.sh

Exception in thread "main" java.lang.UnsupportedOperationException: %%%%%% FIXME unimplemented

The UnsupportedOperationException: %%%%%% FIXME unimplemented fingerprint is the raw exception thrown at the negative remainingBodyBytes check in CommandAssembler.consumeBodyFrame. This line shows the malformed declared-size/body-size sequence reached the vulnerable assembler path.

Impact

The attacker model is a remote AMQP broker peer that the RabbitMQ Java Client application has accepted, including a malicious broker endpoint, a compromised broker, or routing that sends the client to an attacker-controlled peer. The peer needs a non-zero open channel that can receive a content-bearing server-to-client method such as basic.deliver, then sends the method frame, a content header declaring a body below the configured maximum, and a body frame whose payload exceeds that declared size. Under those conditions, the peer can force frame processing to fail with UnsupportedOperationException and close the AMQP connection, producing a client-side denial of service for work depending on that connection; the finding does not indicate memory corruption, data disclosure, or code execution.

Severity

6.3 (Medium)


                  
                    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

Show details on source website

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.30.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.rabbitmq:amqp-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.31.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63335"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T16:32:42Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nRabbitMQ Java Client\u0027s 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. \n\nThis was discovered based on an existing vulnerability CVE-2017-15699.\n\n### Details\nInbound 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 `src/main/java/com/rabbitmq/client/impl/AMQConnection.java:766`). The channel then passes the frame to the current command assembler through `AMQChannel.handleFrame` and `AMQCommand.handleFrame` (`src/main/java/com/rabbitmq/client/impl/AMQChannel.java:121`, `src/main/java/com/rabbitmq/client/impl/AMQCommand.java:114`). When a content-bearing method is followed by a content header, `CommandAssembler.consumeHeaderFrame` records the header\u0027s declared body size in `remainingBodyBytes` after only checking it against the configured maximum (`src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:126` through `src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:139`). The body-frame path subtracts the received payload length from that remaining count before validating that the payload fits (`src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:145` through `src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:149`), so a body frame larger than the declared size drives the count negative and reaches the raw `UnsupportedOperationException` at `src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:150` and `src/main/java/com/rabbitmq/client/impl/CommandAssembler.java:151`. `AMQConnection` catches the resulting throwable in frame processing and performs connection failure handling and final shutdown (`src/main/java/com/rabbitmq/client/impl/AMQConnection.java:695` through `src/main/java/com/rabbitmq/client/impl/AMQConnection.java:705`).\n\n### PoC\n[poc.zip](https://github.com/user-attachments/files/28182717/poc.zip)\n\n```bash\nbash ./poc/run.sh\n```\n\n```text\nException in thread \"main\" java.lang.UnsupportedOperationException: %%%%%% FIXME unimplemented\n```\n\nThe `UnsupportedOperationException: %%%%%% FIXME unimplemented` fingerprint is the raw exception thrown at the negative `remainingBodyBytes` check in `CommandAssembler.consumeBodyFrame`. This line shows the malformed declared-size/body-size sequence reached the vulnerable assembler path.\n\n### Impact\nThe attacker model is a remote AMQP broker peer that the RabbitMQ Java Client application has accepted, including a malicious broker endpoint, a compromised broker, or routing that sends the client to an attacker-controlled peer. The peer needs a non-zero open channel that can receive a content-bearing server-to-client method such as `basic.deliver`, then sends the method frame, a content header declaring a body below the configured maximum, and a body frame whose payload exceeds that declared size. Under those conditions, the peer can force frame processing to fail with `UnsupportedOperationException` and close the AMQP connection, producing a client-side denial of service for work depending on that connection; the finding does not indicate memory corruption, data disclosure, or code execution.",
  "id": "GHSA-qx7j-jv8m-fppr",
  "modified": "2026-08-18T16:32:43Z",
  "published": "2026-08-18T16:32:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-qx7j-jv8m-fppr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/pull/1959"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/pull/1960"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/commit/31735344d9f9dfc53740b67f06e560e8846b9322"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/commit/abd6d60d4e2bfc1a327dc90ab246b2e8aca1f33b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.31.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RabbitMQ Java client malformed body frame triggers raw command assembler exception"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-63335 (GCVE-0-2026-63335)

FKIE_CVE-2026-63335

GHSA-QX7J-JV8M-FPPR

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature