CVE-2026-67235

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6 security-advisories@github.com
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0 security-advisories@github.com
• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q8g2-pc7m-m3jw security-advisories@github.com

The full cvelistV5 record. Download as CVE-2026-67235.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "rabbitmq-server",
          "vendor": "rabbitmq",
          "versions": [
            {
              "status": "affected",
              "version": ">= 4.2.0, < 4.2.6"
            },
            {
              "status": "affected",
              "version": ">= 4.1.0, < 4.1.11"
            },
            {
              "status": "affected",
              "version": ">= 4.0.0, < 4.0.20"
            },
            {
              "status": "affected",
              "version": ">= 3.13.0, < 3.13.15"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "RabbitMQ is a messaging and streaming broker. Prior to versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15, The content-header BodySize (a uint64) was stored without validation against max_message_size. The size check ran only when assembly completed. By declaring body_size = 2^63-1 and then streaming fragments, a client ensured that check_msg_size never fired, so the accumulated body size went unbounded. A reader process accumulates memory until the memory alarm fires, degrading all publishers cluster-wide, or until the node runs out of memory. The memory alarm provides only partial mitigation, since it is reactive rather than preventive. AMQP 0-9-1 is the most widely used protocol, and any publisher can trigger this condition. Preconditions include Any authenticated AMQP 0-9-1 client with publish permission can exploit this.. This issue is fixed in versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-23T20:36:37.508Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q8g2-pc7m-m3jw",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q8g2-pc7m-m3jw"
        },
        {
          "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6"
        },
        {
          "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0"
        }
      ],
      "source": {
        "advisory": "GHSA-q8g2-pc7m-m3jw",
        "discovery": "UNKNOWN"
      },
      "title": "RabbitMQ: AMQP 0-9-1 body assembly never validates accumulated size"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-67235",
    "datePublished": "2026-09-23T20:36:37.508Z",
    "dateReserved": "2026-07-28T19:50:39.438Z",
    "dateUpdated": "2026-09-23T20:36:37.508Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}