Critical

RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr

Type: advisorySources: OSV

RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, readLongstr in read.go returns an empty string and a nil error when a declared AMQP longstr length exceeds 0x7FFFFFFF instead of returning ErrSyntax. The function leaves the declared field bytes unread, while readTable treats the operation as successful and continues parsing from the wrong offset. A malicious or compromised broker can provide an oversized longstr in a table field and desynchronize subsequent AMQP parsing, causing attacker-controlled trailing bytes to be interpreted as later fields or frames and disrupting connection integrity and availability. This issue is fixed in version 1.13.0.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-77411
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 06:04 UTC · Revision 1

Source evidence

RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr

core-osv · Original source

Published 16 Sept 2026, 14:45 UTC

osv:CVE-2026-77411

Complete source record

{
  "id": "ec63f82d77246ec316630fe9710800514d46f2a1126d8207b5930d2931f70923",
  "url": "https://osv.dev/vulnerability/CVE-2026-77411",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ amqp091-go: Protocol Desynchronization and Frame Injection via Integer Overflow in readLongstr",
    "summary": "RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, readLongstr in read.go returns an empty string and a nil error when a declared AMQP longstr length exceeds 0x7FFFFFFF instead of returning ErrSyntax. The function leaves the declared field bytes unread, while readTable treats the operation as successful and continues parsing from the wrong offset. A malicious or compromised broker can provide an oversized longstr in a table field and desynchronize subsequent AMQP parsing, causing attacker-controlled trailing bytes to be interpreted as later fields or frames and disrupting connection integrity and availability. This issue is fixed in version 1.13.0.",
    "evidence": "osv:CVE-2026-77411",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-77411",
      "aliases": [
        "CVE-2026-77411",
        "GHSA-c5pq-fr2g-9jpf",
        "GO-2026-6496"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rabbitmq/amqp091-go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d26d57e952cc61554ea9c54bd676c8f40ed0d84d"
                },
                {
                  "fixed": "143c1ace5fa7344cee135e5c7d22970f0de68282"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.13.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "143c1ace5fa7344cee135e5c7d22970f0de68282"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d26d57e952cc61554ea9c54bd676c8f40ed0d84d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.13.0"
                  }
                ]
              }
            }
          ],
          "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-2026-77411.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.310657836Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/amqp091-go/releases/tag/v1.13.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77411.json",
        "https://github.com/rabbitmq/amqp091-go/security/advisories/GHSA-c5pq-fr2g-9jpf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77411",
        "https://github.com/rabbitmq/amqp091-go/commit/143c1ace5fa7344cee135e5c7d22970f0de68282",
        "https://github.com/rabbitmq/amqp091-go/pull/347"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-754"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77411.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77411",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510940,
  "published_at": "2026-09-16T14:45:48.976+00:00"
}