CVE-2026-77410: RabbitMQ amqp091-go Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r9c8-gcjp-xfwh",
  "modified" : "2026-09-17T17:04:20Z",
  "published" : "2026-09-17T17:04:20Z",
  "aliases" : [ "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.",
  "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:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rabbitmq/amqp091-go"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "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" : "WEB",
    "url" : "https://github.com/rabbitmq/amqp091-go/pull/346"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rabbitmq/amqp091-go/commit/91b65fa0096a99a580cf51a31b24028ff1c60382"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rabbitmq/amqp091-go"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-789" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-17T17:04:20Z",
    "nvd_published_at" : "2026-09-16T15:17:50Z"
  }
}