ghsa-6g32-pxv4-2wfj

{
  "affected": [
    {
      "database_specific": {
        "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-6g32-pxv4-2wfj/GHSA-6g32-pxv4-2wfj.json"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.rabbitmq:amqp-client",
        "purl": "pkg:maven/com.rabbitmq/amqp-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.33.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.0",
        "1.5.4",
        "1.5.5",
        "1.6.0",
        "1.7.2",
        "1.8.0",
        "1.8.1",
        "2.0.0",
        "2.1.0",
        "2.1.1",
        "2.2.0",
        "2.3.0",
        "2.3.1",
        "2.4.1",
        "2.5.0",
        "2.5.1",
        "2.6.0",
        "2.6.1",
        "2.7.0",
        "2.7.1",
        "2.8.0",
        "2.8.1",
        "2.8.2",
        "2.8.3",
        "2.8.4",
        "2.8.5",
        "2.8.6",
        "2.8.7",
        "3.0.0",
        "3.0.1",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "3.1.0",
        "3.1.1",
        "3.1.2",
        "3.1.3",
        "3.1.4",
        "3.2.0",
        "3.2.1",
        "3.2.2",
        "3.2.3",
        "3.2.4",
        "3.3.0",
        "3.3.1",
        "3.3.2",
        "3.3.3",
        "3.3.4",
        "3.3.5",
        "3.4.0",
        "3.4.1",
        "3.4.2",
        "3.4.3",
        "3.4.4",
        "3.5.0",
        "3.5.1",
        "3.5.2",
        "3.5.3",
        "3.5.4",
        "3.5.5",
        "3.5.6",
        "3.5.7",
        "3.6.0",
        "3.6.1",
        "3.6.2",
        "3.6.3",
        "3.6.4",
        "3.6.5",
        "3.6.6",
        "4.0.0",
        "4.0.1",
        "4.0.2",
        "4.0.3",
        "4.1.0",
        "4.1.1",
        "4.10.0",
        "4.11.0",
        "4.11.1",
        "4.11.2",
        "4.11.3",
        "4.12.0",
        "4.2.0",
        "4.2.1",
        "4.2.2",
        "4.3.0",
        "4.4.0",
        "4.4.1",
        "4.4.2",
        "4.5.0",
        "4.6.0",
        "4.7.0",
        "4.8.0",
        "4.8.1",
        "4.8.2",
        "4.8.3",
        "4.9.0",
        "4.9.1",
        "4.9.2",
        "4.9.3",
        "5.0.0",
        "5.1.0",
        "5.1.1",
        "5.1.2",
        "5.10.0",
        "5.11.0",
        "5.12.0",
        "5.13.0",
        "5.13.1",
        "5.14.0",
        "5.14.1",
        "5.14.2",
        "5.14.3",
        "5.15.0",
        "5.16.0",
        "5.16.1",
        "5.17.0",
        "5.17.1",
        "5.18.0",
        "5.19.0",
        "5.2.0",
        "5.20.0",
        "5.21.0",
        "5.22.0",
        "5.23.0",
        "5.24.0",
        "5.25.0",
        "5.26.0",
        "5.27.0",
        "5.27.1",
        "5.28.0",
        "5.29.0",
        "5.3.0",
        "5.30.0",
        "5.31.0",
        "5.32.0",
        "5.4.0",
        "5.4.1",
        "5.4.2",
        "5.4.3",
        "5.5.0",
        "5.5.1",
        "5.5.2",
        "5.5.3",
        "5.6.0",
        "5.7.0",
        "5.7.1",
        "5.7.2",
        "5.7.3",
        "5.8.0",
        "5.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63337"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-470"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T16:32:29Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "The JSON-RPC tools in `com.rabbitmq.tools.jsonrpc` perform `Class.forName(javaReturnType)` with `initialize=true` on class names received from untrusted AMQP messages, without any validation or allowlist.\n\n**Vulnerable code** (`ProcedureDescription.java:101-127`):\nWhen a `JsonRpcClient` connects, it calls `system.describe` and receives a service description from the AMQP queue. The response JSON includes `javaReturnType` fields that are reflectively set via `JSONUtil.tryFill()`, triggering `setJavaReturnType()` → `computeReturnTypeAsJavaClass()` → `Class.forName(javaReturnType)`.\n\n**Attack scenario:**\n1. Victim uses `JsonRpcClient` to connect to a JSON-RPC service via RabbitMQ\n2. Attacker (co-tenant on shared broker, or MITM) intercepts the `system.describe` request\n3. Attacker responds with crafted `javaReturnType` values\n4. Victim's client calls `Class.forName(attackerInput)` with default `initialize=true`\n5. Static initializers of attacker-specified classes execute in victim's JVM\n\nAdditionally, the loaded class from `getReturnType()` is passed to `mapper.parse(replyStr, expectedType)` at `JsonRpcClient.java:168`, potentially enabling type-confusion.\n\n**Recommended fix:** Use `Class.forName(javaReturnType, false, classLoader)` to prevent static initializer execution, or add an allowlist of permitted return types.\n\n**CWE:** CWE-470\n\n---\n\n**Reply from reporter (2026-06-29):** Thanks for the quick turnaround. Fix looks good. Looking forward to the CVE assignment.",
  "id": "GHSA-6g32-pxv4-2wfj",
  "modified": "2026-09-10T03:51:13.214436792Z",
  "published": "2026-08-18T16:32:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/security/advisories/GHSA-6g32-pxv4-2wfj"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/pull/2000"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/pull/2002"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/commit/0032f75f9dc3df847f94b2b85a16119250bf63cb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/commit/9f8e7efd0c648f235dc0e96232ae7efa75ea4fa8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-java-client/releases/tag/v5.33.0"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RabbitMQ Java client: Unvalidated Class.forName in JSON-RPC ProcedureDescription enables arbitrary class loading"
}