{"id":"CVE-2026-77410","aliases":["GHSA-r9c8-gcjp-xfwh","GO-2026-6500"],"url":"https://o3.security/vulnerability/CVE-2026-77410","summary":"RabbitMQ amqp091-go: Resource Exhaustion (OOM) via Unbounded Body Buffer Allocation","details":"**Summary**\nA flaw in the `recvContent` function allows a malicious AMQP server to trigger an Out-of-Memory (OOM) error, forcing the host operating system or container runtime to immediately terminate the client process.\n\n**Vulnerability Details**\nWhen receiving message content payloads, the client processes the expected size from the content header framework. The `recvContent` function attempts to optimize performance by pre-allocating memory for the message body based on the `ch.header.Size` field, which is a 64-bit unsigned integer (`uint64`).\n\n```go\n// channel.go:495-496\nif cap(ch.body) == 0 {\n    ch.body = make([]byte, 0, ch.header.Size)  // unbounded\n}\n```\n\nThe underlying library fails to validate or cap this requested size against any upper boundary—such as the maximum frame size negotiated during connection establishment (`FrameMax`). If a server specifies an extreme body size (e.g., `2^62` bytes), the Go runtime attempts to allocate an exabyte-scale slice capacity. This immediately exhausts available system memory, causing the operating system's OOM killer to terminate the application.\n\n**Attack Vector / Exploitation Scenario**\n\n- Message Delivery Phase: A malicious or compromised AMQP broker sends a standard `basic.deliver` frame containing a content header with an intentionally inflated `body-size` variable.\n- Authentication Requirement: No special privileges or authentication bypasses are required; the crash occurs seamlessly during normal message consumption.\n\n**Impact**\n\n- Availability: High. Exploded memory consumption results in an instant process termination, destroying application state and availability for all threads sharing the environment.","published":"2026-09-16T14:39:08.872Z","modified":"2026-10-28T02:30:21.678037353Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"github.com/rabbitmq/amqp091-go","fixedVersion":"1.13.0"}],"fix":{"url":"https://github.com/rabbitmq/amqp091-go/commit/91b65fa0096a99a580cf51a31b24028ff1c60382","label":"rabbitmq/amqp091-go@91b65fa"},"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-2026-77410.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-r9c8-gcjp-xfwh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77410"},{"type":"FIX","url":"https://github.com/rabbitmq/amqp091-go/commit/91b65fa0096a99a580cf51a31b24028ff1c60382"},{"type":"FIX","url":"https://github.com/rabbitmq/amqp091-go/pull/346"},{"type":"PACKAGE","url":"https://github.com/rabbitmq/amqp091-go"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:21.678037353Z"}}