{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "1.9.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "3288589e5248dcc1da769cc578827a9ee1adc941"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "1.9.2",
                "range": [
                  {
                    "fixed": "2f1192bb3285dea2c8b8ece461d52967fe0e6706"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2f1192bb3285dea2c8b8ece461d52967fe0e6706"
            },
            {
              "fixed": "3288589e5248dcc1da769cc578827a9ee1adc941"
            }
          ],
          "repo": "https://github.com/bulwarkmail/webmail",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-24w9-8r42-8jwm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113728.json"
  },
  "details": "Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.9.2, the unauthenticated POST /api/fetch-ical endpoint validates a caller-supplied hostname with one DNS lookup and then passes the URL to fetch, which performs a separate lookup for the socket connection. An attacker controlling authoritative DNS can return a public address during validation and then rebind the hostname to a loopback, private, link-local, or cloud metadata address for the connection, causing the server to return up to 10 MB of an internal HTTP or HTTPS response. The same check-then-fetch pattern also existed in authenticated JMAP login and TOTP token-exchange flows. This issue is fixed in version 1.9.2.",
  "id": "CVE-2026-113728",
  "modified": "2026-10-21T10:30:37.308823032Z",
  "published": "2026-10-20T21:12:38.182Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113728.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/bulwarkmail/webmail/commit/3288589e5248dcc1da769cc578827a9ee1adc941"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bulwarkmail/webmail/releases/tag/1.9.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bulwarkmail/webmail/security/advisories/GHSA-24w9-8r42-8jwm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113728"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bulwark Webmail: DNS-rebinding SSRF in public iCalendar fetch endpoint"
}