CVE-2026-67238 (GCVE-0-2026-67238)

Vulnerability from cvelistv5 – Published: 2026-09-23 19:58 – Updated: 2026-09-23 19:58
VLAI
Title
RabbitMQ: Atom-table exhaustion via reply-to queue name decoding
Summary
RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, rabbit_pid_codec:decompose_from_binary/1 parses a caller-supplied ETF-encoded binary and calls binary_to_atom(Node, utf8) on the node-name field. It is reached from rabbit_volatile_queue:pid_from_name/2, which is invoked for any queue name / routing key beginning amq.rabbitmq.reply-to.. The CandidateNodes membership check happens after the atom is created, and the surrounding try/catch cannot reclaim atoms (they are never GC'd). binary_to_existing_atom is not used. Any authenticated AMQP client can crash the entire Erlang VM (all vhosts, all connections) with ~1M cheap requests. Preconditions include Authenticated AMQP 0-9-1 connection to any vhost No per-connection rate limit low enough to make ~1M operations infeasible. This issue is fixed in versions 4.2.7 and 4.3.1.
Severity
7.1 (High)
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
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version CPE status
rabbitmq rabbitmq-server Affected: >= 4.2.0, < 4.2.7
Affected: >= 4.3.0, < 4.3.1
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{
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          "product": "rabbitmq-server",
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          "versions": [
            {
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              "version": "\u003e= 4.2.0, \u003c 4.2.7"
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        }
      ],
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            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "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",
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7",
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          "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7"
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          "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1",
          "tags": [
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          "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1"
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      ],
      "source": {
        "advisory": "GHSA-x96j-244m-mrr2",
        "discovery": "UNKNOWN"
      },
      "title": "RabbitMQ: Atom-table exhaustion via reply-to queue name decoding"
    }
  },
  "cveMetadata": {
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    "cveId": "CVE-2026-67238",
    "datePublished": "2026-09-23T19:58:35.019Z",
    "dateReserved": "2026-07-28T19:50:39.438Z",
    "dateUpdated": "2026-09-23T19:58:35.019Z",
    "state": "PUBLISHED"
  },
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      "percentile": "0.23396"
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    "nvd": {
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                    "version": "\u003e= 4.2.0, \u003c 4.2.7"
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          }
        ],
        "id": "CVE-2026-67238",
        "lastModified": "2026-09-24T15:02:58.307",
        "metrics": {
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                "Recovery": "NOT_DEFINED",
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                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "LOW",
                "providerUrgency": "NOT_DEFINED",
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                "valueDensity": "NOT_DEFINED",
                "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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        "vulnStatus": "Awaiting Analysis",
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    "redhat_vex": {
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      "cve": "CVE-2026-67238",
      "id": "CVE-2026-67238",
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      "product_status:known_affected": "3",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "rabbitmq-server: RabbitMQ: Denial of Service due to atom-table exhaustion via reply-to queue name decoding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67238.json",
      "version": "3"
    }
  }
}



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