{"id":"CVE-2026-77409","summary":"RabbitMQ amqp091-go: Denial of Service via Synchronous Event Channel Blocking","details":"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.","aliases":["GHSA-wxx3-cj7g-w73j"],"modified":"2026-09-20T11:30:40.482012538Z","published":"2026-09-16T14:48:00.669Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77409.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77409.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-wxx3-cj7g-w73j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77409"},{"type":"FIX","url":"https://github.com/rabbitmq/amqp091-go/commit/5b0ccbb8d7bc3dfa18129d9b0f9256d656809494"},{"type":"FIX","url":"https://github.com/rabbitmq/amqp091-go/pull/349"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/amqp091-go","events":[{"introduced":"0"},{"fixed":"5b0ccbb8d7bc3dfa18129d9b0f9256d656809494"},{"fixed":"d26d57e952cc61554ea9c54bd676c8f40ed0d84d"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.13.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"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"}}],"schema_version":"1.9.0","severity":[{"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"}]}