amqp091-go: Pre-negotiation frame limit is not enforced to 4KB

{
  "id": "cc0b95067f24fe5de65e60e47de8ad01a7f9099198317c0f4548ba8d04144607",
  "url": "https://osv.dev/vulnerability/GHSA-w6r9-248c-frg8",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "amqp091-go: Pre-negotiation frame limit is not enforced to 4KB",
    "summary": "## Summary The frame-size mitigation released in `amqp091-go` v1.13.0 can be bypassed before `connection.tune` completes. A malicious or compromised AMQP peer can send only a seven-byte body-frame header containing a large attacker-controlled `uint32` payload length. The client allocates a slice of that declared length before it verifies that the payload exists or rejects the frame for its invalid protocol state. The bypass occurs because `Connection.maxFrameSize` starts at zero. The reader interprets zero as both “negotiated unlimited” and “not negotiated yet,” and skips the pre-allocation size check in either case. `Open` starts the reader goroutine before negotiation and does not store a limit until after it receives `connection.tune`. This remains reachable even if the caller explicitly uses `Config{FrameSize: frameMinSize}`. A malicious broker can therefore cause excessive memory allocation, potentially terminating the Go client process through memory exhaustion, before authentication and connection setup complete. ## Relationship to the existing advisory [GHSA-r9c8-gcjp-xfwh](https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-r9c8-gcjp-xfwh) describes attacker-controlled, unbounded allocation by a malicious broker and identifies v1.13.0 as the patched version. [Pull request 369](https://github.com/rabbitmq/amqp091-go/pull/369) added a frame-size check before parser allocation, but the check is active only when the stored maximum is nonzero. The v1.13.0 sour",
    "evidence": "osv:GHSA-w6r9-248c-frg8",
    "products": [
      {
        "name": {
          "value": "github.com/rabbitmq/amqp091-go",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.14.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-w6r9-248c-frg8",
      "aliases": [
        "CVE-2026-107386",
        "GHSA-w6r9-248c-frg8",
        "GO-2026-6700"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.14.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/rabbitmq/amqp091-go",
            "purl": "pkg:golang/github.com/rabbitmq/amqp091-go",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-w6r9-248c-frg8/GHSA-w6r9-248c-frg8.json"
          }
        }
      ],
      "modified": "2026-10-19T21:41:15.822630367Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-w6r9-248c-frg8",
        "https://github.com/rabbitmq/amqp091-go/pull/377",
        "https://github.com/rabbitmq/amqp091-go/commit/6723e8cff8710f0a6bf5fb4af375e285052535b3",
        "https://github.com/rabbitmq/amqp091-go",
        "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.14.0"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-08T19:40:19Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107386",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 376789,
  "published_at": "2026-10-08T19:40:19+00:00"
}

{
  "id": "1ef9b9793203bb65bf48cb66dd2bf95236c5bb6d358ef275375c941d5e4822b1",
  "url": "https://osv.dev/vulnerability/GO-2026-6700",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Pre-negotiation frame limit is not enforced to 4KB in github.com/rabbitmq/amqp091-go",
    "summary": "Pre-negotiation frame limit is not enforced to 4KB in github.com/rabbitmq/amqp091-go",
    "evidence": "osv:GO-2026-6700",
    "products": [
      {
        "name": {
          "value": "github.com/rabbitmq/amqp091-go",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.14.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "GO-2026-6700",
      "aliases": [
        "CVE-2026-107386",
        "GHSA-w6r9-248c-frg8",
        "GO-2026-6700"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.14.0"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/rabbitmq/amqp091-go",
            "purl": "pkg:golang/github.com/rabbitmq/amqp091-go",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://vuln.go.dev/ID/GO-2026-6700.json"
          },
          "ecosystem_specific": {
            "imports": [
              {
                "path": "github.com/rabbitmq/amqp091-go",
                "symbols": [
                  "Dial",
                  "DialConfig",
                  "DialTLS",
                  "DialTLS_ExternalAuth",
                  "Open"
                ]
              }
            ]
          }
        }
      ],
      "modified": "2026-10-19T21:31:49.521720293Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-w6r9-248c-frg8",
        "https://github.com/rabbitmq/amqp091-go/commit/6723e8cff8710f0a6bf5fb4af375e285052535b3",
        "https://github.com/rabbitmq/amqp091-go/pull/377",
        "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.14.0"
      ],
      "provider_metadata": {
        "url": "https://pkg.go.dev/vuln/GO-2026-6700",
        "review_status": "REVIEWED"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107386",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 376688,
  "published_at": "2026-10-19T21:08:21+00:00"
}