{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.2.0"
              },
              {
                "fixed": "4.2.9"
              },
              {
                "introduced": "4.3.0"
              },
              {
                "fixed": "4.3.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "95c501fbad76c66156346cf364d158d6e30aa4d9"
            },
            {
              "introduced": "1929eeadf9b2bac12c5434fb56884ef27370580e"
            },
            {
              "fixed": "47d6d6457c7d1a440daed643cb7d76bba313e79c"
            },
            {
              "fixed": "1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"
            },
            {
              "fixed": "d10a369a96658d0fba1050bd43c732e58fcf28fd"
            },
            {
              "fixed": "f189a8824c9efbce46bd9438fcdbda4521cfc923"
            }
          ],
          "repo": "https://github.com/rabbitmq/rabbitmq-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rrj4-g94f-rqj9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-613"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67242.json"
  },
  "details": "RabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.9 and 4.3.3, OAuth2 isinteger(Exp) guard skips token-expiry checks for float exp. validatetokenexpiry/1 (lines 208-214) and expirytimestamp/1 (138-144) both guard with 'when isinteger(Exp)' and fall through to ok/never for float values. josejwt:verify validates only the signature, not exp. With float exp, no expiry validation occurs anywhere in the If the IdP emits exp as a JSON float (RFC 7519 permits fractional NumericDate), both the login-time expiry check and the mid-connection disconnect timer are silently skipped , an already-expired token is accepted, and connections never time OAuth2 backend enabled IdP emits float exp (uncommon; mainstream IdPs emit integers) Attacker possesses a previously-valid signed. This issue is fixed in versions 4.2.9 and 4.3.3.",
  "id": "CVE-2026-67242",
  "modified": "2026-09-27T03:30:24.489877829Z",
  "published": "2026-09-25T16:16:14.558Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67242.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rrj4-g94f-rqj9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67242"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rabbitmq/rabbitmq-server/commit/d10a369a96658d0fba1050bd43c732e58fcf28fd"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rabbitmq/rabbitmq-server/commit/f189a8824c9efbce46bd9438fcdbda4521cfc923"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RabbitMQ: OAuth2 is_integer(Exp) guard skips token-expiry checks for float exp"
}