Security advisory

{
  "id": "03696e5548c2c4e764e5d6e86d53c875ecfb605af8b0b0441c2738f82eb1622a",
  "url": "https://osv.dev/vulnerability/CVE-2019-12855",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-12855",
    "summary": "In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.",
    "evidence": "osv:CVE-2019-12855",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-12855",
      "aliases": [
        "CVE-2019-12855",
        "GHSA-65rm-h285-5cc5",
        "PYSEC-2019-129"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/twisted/twisted",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "c0776850e756adfcdc179a7fd9e4c8f5cbc4838d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "19.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "twisted-19.2.1",
            "twisted-19.2.0",
            "before-black"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-12855.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:20.552750293Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/",
        "https://usn.ubuntu.com/4308-1/",
        "https://usn.ubuntu.com/4308-2/",
        "https://www.oracle.com/security-alerts/cpuapr2020.html",
        "https://twistedmatrix.com/trac/ticket/9561",
        "https://github.com/twisted/twisted/pull/1147"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-12855",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383573,
  "published_at": "2019-06-16T12:29:00.227+00:00"
}