{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.0.5"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2bb3af1ade5bb3613dc88d44164abbe1230cd679"
            },
            {
              "fixed": "5797f013b3be450c146a4141514bda525f2f1b51"
            }
          ],
          "repo": "https://github.com/zulip/zulip",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages.",
  "id": "CVE-2019-16215",
  "modified": "2026-03-13T21:56:50.694384617Z",
  "published": "2019-09-18T12:15:10.910Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}