{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.30.0"
              },
              {
                "fixed": "1.30.5"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "af8756a32cf7ecf06bef109c1348b783f1a239ee"
            },
            {
              "fixed": "8720c6bd8281fc00d458081908f1dbef8e59a98c"
            },
            {
              "fixed": "e219c7379345a0e826f6f216cccc51e1328008d7"
            }
          ],
          "repo": "https://github.com/axllent/mailpit",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r553-m4fv-5v97"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67447.json"
  },
  "details": "Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData() function calls bufio.Reader.ReadBytes before applying the len(data)+len(line) size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client can send a single line larger than the configured MaxMessageSize, causing the full line to be allocated before Mailpit returns the 552 5.3.4 rejection. This post-fix gap remains after normal multi-line DATA accumulation was bounded, and concurrent oversized lines can create substantial memory pressure beyond the configured message-size cap. This issue is fixed in version 1.30.5.",
  "id": "CVE-2026-67447",
  "modified": "2026-08-23T03:42:48.151553070Z",
  "published": "2026-08-20T21:15:06.567Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67447.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-r553-m4fv-5v97"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67447"
    },
    {
      "type": "FIX",
      "url": "https://github.com/axllent/mailpit/commit/8720c6bd8281fc00d458081908f1dbef8e59a98c"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement"
}