CVE-2026-42209

{
  "id": "CVE-2026-42209",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-08T22:16:32.103",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1."
    },
    {
      "lang": "es",
      "value": "FlashMQ es un broker/servidor MQTT, diseñado para entornos multi-CPU. Antes de la versión 1.26.1, un cliente remoto con permiso de publicación retenida puede provocar la caída del broker FlashMQ cuando tanto set_retained_message_defer_timeout como set_retained_message_defer_timeout_spread están configurados con valores no predeterminados, lo que resulta en una denegación de servicio. Si se permite la publicación retenida anónima, no se requiere autenticación; de lo contrario, el atacante necesita el permiso de publicación correspondiente. Este problema ha sido parcheado en la versión 1.26.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "halfgaar",
          "product": "FlashMQ",
          "versions": [
            {
              "version": "< 1.26.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-11T15:59:23.887272Z",
          "id": "CVE-2026-42209",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-369"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/halfgaar/FlashMQ/commit/193b6e7767889511cfa8e933908ea5e6a1077a1f",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/halfgaar/FlashMQ/issues/167",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.1",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-2789-vfcg-5922",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/halfgaar/FlashMQ/issues/167",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}