{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3ECED29B-387E-4170-B0E7-1818C63ADB60",
              "versionEndExcluding": "1.30.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go\u0027s zero value (0 \u21d2 \"no limit\"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit\u0027s default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10\u00d7 amplification factor (raw frame \u2192 enmime envelope tree \u2192 search-text index \u2192 zstd-encoded write to SQLite). Repeating the attack \u2014 or running it concurrently from multiple connections \u2014 drives the process to OOM-kill. Version 1.30.0 contains a patch."
    },
    {
      "lang": "es",
      "value": "Mailpit es una herramienta de prueba de correo electr\u00f3nico y API para desarrolladores. Antes de la versi\u00f3n 1.30.0, el servidor SMTP de Mailpit tiene un campo int Server.MaxSize que controla el tama\u00f1o m\u00e1ximo permitido de la carga \u00fatil DATA, pero el campo nunca se asigna en ning\u00fan lugar fuera del c\u00f3digo de prueba, dej\u00e1ndolo en el valor cero de Go (0 ? \u2019sin l\u00edmite\u2019). Lo mismo se aplica al endpoint HTTP /api/v1/send, cuyo cuerpo de solicitud se decodifica con json.NewDecoder(r.Body) y sin http.MaxBytesReader. Debido a que los oyentes predeterminados de Mailpit se enlazan a [::]:1025 (SMTP) y [::]:8025 (HTTP), sin autenticaci\u00f3n requerida en ninguno de ellos, un \u00fanico atacante accesible por red puede introducir un mensaje arbitrariamente grande en Mailpit y observar c\u00f3mo el consumo de RAM se dispara con un factor de amplificaci\u00f3n de ~7-10\u00d7 (marco sin procesar ? \u00e1rbol de sobres enmime ? \u00edndice de texto de b\u00fasqueda ? escritura codificada en zstd a SQLite). Repetir el ataque - o ejecutarlo concurrentemente desde m\u00faltiples conexiones - lleva el proceso a un OOM-kill. La versi\u00f3n 1.30.0 contiene un parche."
    }
  ],
  "id": "CVE-2026-45713",
  "lastModified": "2026-10-24T20:10:00.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45713",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-20T16:16:33.595846Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-20T16:17:00.610",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}