RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking

{
  "id": "6e6e9f362323d7d840e64dbff3497216122517288d8514f11d5be07d358bcce6",
  "url": "https://osv.dev/vulnerability/CVE-2026-77409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking",
    "summary": "RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Channel.dispatch in channel.go, confirms.confirm in confirms.go, and Connection.dispatch0 in connection.go synchronously send publisher confirmations, flow-control events, consumer cancellations, returned messages, including NotifyConfirm events and connection block notifications, to application-provided channels. If a listener channel is unbuffered, full, or not drained promptly, the sole reader goroutine blocks and stops processing frames, acknowledgments, deliveries, and heartbeats. Broker-driven event bursts can therefore cause connection stalls, missed heartbeats, deadlocks, and disconnection. This issue is fixed in version 1.13.0.",
    "evidence": "osv:CVE-2026-77409",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-77409",
      "aliases": [
        "CVE-2026-77409",
        "GHSA-wxx3-cj7g-w73j"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rabbitmq/amqp091-go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d26d57e952cc61554ea9c54bd676c8f40ed0d84d"
                },
                {
                  "fixed": "5b0ccbb8d7bc3dfa18129d9b0f9256d656809494"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.13.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5b0ccbb8d7bc3dfa18129d9b0f9256d656809494"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d26d57e952cc61554ea9c54bd676c8f40ed0d84d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.13.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.12.0",
            "v1.11.0",
            "v1.10.0",
            "v1.9.0",
            "v1.8.1",
            "v1.8.0",
            "v1.7.0",
            "v1.6.1",
            "v1.6.1-rc.2",
            "v1.6.1-rc.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.4",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77409.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.144403258Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77409.json",
        "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77409",
        "https://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494",
        "https://github.com/rabbitmq/amqp091-go/pull/349"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77409.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77409",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507612,
  "published_at": "2026-09-16T14:48:00.669+00:00"
}