RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation

{
  "id": "3a9a2cadd2e42a63f8604059fdc5b933dccd2352c6b72c80925e6b4a317e2fcc",
  "url": "https://osv.dev/vulnerability/BIT-rabbitmq-2026-67414",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ AMQP 1.0 parser: amplification memory-exhaustion DoS via zero-width array aggregation",
    "summary": "RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.24, 4.1.15, 4.2.10, and 4.3.4, deps/amqp10_common/src/amqp10_binary_parser.erl materializes each element of AMQP 1.0 arrays whose shared constructor has zero width, while limiting only the number of elements in each array and not the aggregate arrays in a frame. After completing SASL authentication, a low-privilege client can send an ordinary frame containing many individually permitted arrays, causing a small frame to expand into a very large reader-process heap before later frame validation or authorization. Because deps/rabbit/src/rabbit_amqp_reader.erl clears the pre-authentication max_heap_size guard after login, repeated or concurrent frames can trigger the node-wide memory alarm, block publishers, or exhaust broker memory. This issue is fixed in versions 4.0.24, 4.1.15, 4.2.10, and 4.3.4.",
    "evidence": "osv:BIT-rabbitmq-2026-67414",
    "products": [
      {
        "name": {
          "value": "rabbitmq",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.0.24",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.1.15",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.2.10",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.3.4",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-rabbitmq-2026-67414",
      "aliases": [
        "BIT-rabbitmq-2026-67414",
        "CVE-2026-67414",
        "GHSA-w6mq-4qpx-v7mh"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "4.0.0"
                },
                {
                  "fixed": "4.0.24"
                },
                {
                  "introduced": "4.1.0"
                },
                {
                  "fixed": "4.1.15"
                },
                {
                  "introduced": "4.2.0"
                },
                {
                  "fixed": "4.2.10"
                },
                {
                  "introduced": "4.3.0"
                },
                {
                  "fixed": "4.3.4"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq",
            "purl": "pkg:bitnami/rabbitmq",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/rabbitmq/BIT-rabbitmq-2026-67414.json"
          }
        }
      ],
      "modified": "2026-10-21T12:11:00.250932763Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/commit/3f0f67dfb7c4390e3cbfa25ab3ee19dcb0845bd4",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.4",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-w6mq-4qpx-v7mh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67414"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:vmware:rabbitmq:*:*:*:*:*:*:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67414",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 393025,
  "published_at": "2026-10-21T08:59:26.976+00:00"
}