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          {
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          },
          {
            "last_affected": "7.20.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.",
  "id": "CVE-2026-4873",
  "modified": "2026-07-08T05:39:32.127732764Z",
  "published": "2026-05-13T08:27:04.538Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/29/7"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-4873.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-4873.json"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3621851"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4873.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4873"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "connection reuse ignores TLS requirement"
}