CVE-2026-77412: RabbitMQ amqp091-go Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4v58-74mf-rjx3",
  "modified" : "2026-09-17T17:04:29Z",
  "published" : "2026-09-17T17:04:29Z",
  "aliases" : [ "CVE-2026-77412" ],
  "summary" : "RabbitMQ amqp091-go: Denial of Service via Malicious Field Length in AMQP Client",
  "details" : "**Summary**\nA vulnerability in the readField function allows a malicious or compromised AMQP server to trigger an unhandled runtime panic in the client application, leading to an immediate crash of the entire process.\n\n**Details**\nWhen parsing incoming AMQP frames, the `readField` function processes byte-array fields (type tag `'x'`) by reading a 32-bit big-endian integer to determine the length of the data payload.\n\n```go\n// read.go:253-263\ncase 'x':\n    var len int32\n    if err = binary.Read(r, binary.BigEndian, &len); err != nil {\n        return nil, err\n    }\n    value := make([]byte, len)  // PANICS if len < 0\n```\n\nIf a server transmits a length value of `0xFFFFFFFF`, it is interpreted by the client as a signed 32-bit integer with a value of `-1`. Passing a negative integer to Go's built-in make() function for slice allocation triggers an unrecoverable runtime panic (panic: len out of range).\n\nBecause the reader goroutine handles network I/O without an explicit recover() wrapper, this panic propagates up to the runtime root, abruptly terminating the host application.\n\n**Attack Vector / Exploitation Scenario**\nAn attacker capable of spoofing, compromising, or controlling an AMQP broker can exploit this flaw during two primary phases:\n\n1. Connection Establishment: Sending a malicious connection.start handshake frame containing server-properties with an 'x' type field assigned a negative length.\n2. Message Delivery: Delivering a message payload where the header table contains a malformed field matching the criteria above.\n\n**Impact**\nAvailability: High. A single malformed frame can reliably crash the client process, resulting in a persistent Denial of Service (DoS) if the client automatically reconnects and receives the same payload.",
  "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-4v58-74mf-rjx3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-77412"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rabbitmq/amqp091-go/pull/344"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rabbitmq/amqp091-go/commit/669b42bf7b1db76bc6d4973e3634247f680accbf"
  }, {
    "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-681" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-17T17:04:29Z",
    "nvd_published_at" : "2026-09-16T15:17:50Z"
  }
}