{"id":"CVE-2019-16215","aliases":["EUVD-2019-7027","GHSA-mmx6-xv2h-w7x8"],"status":"published","title":"The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to...","description":"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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01249,"percentile":0.69615,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1333"],"published":"2019-09-18T11:07:00Z","modified":"2026-10-20T10:50:46Z","products":[{"vendor":"zulip","product":"zulip_server"}],"references":[{"url":"https://blog.zulip.org/2019/09/11/zulip-server-2-0-5-security-release/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/zulip/zulip/commit/5797f013b3be450c146a4141514bda525f2f1b51","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-16215"},{"url":"https://github.com/advisories/GHSA-mmx6-xv2h-w7x8"}],"sources":{"cve":[{"id":"CVE-2019-16215","description":"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.","status":"published","published":"2019-09-18T11:07:00Z","modified":"2024-08-05T01:10:41.419Z","updated_at":"2026-11-02T14:32:23.485011Z"}],"euvd":[{"id":"EUVD-2019-7027","description":"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.","status":"published","published":"2019-09-18T11:07:00Z","modified":"2024-08-05T01:10:41Z","updated_at":"2026-11-03T02:40:33.71788Z"}],"ghsa":[{"id":"GHSA-mmx6-xv2h-w7x8","title":"The Markdown parser in Zulip server before 2.0.5 used a regular expression vulnerable to...","description":"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.","status":"published","published":"2022-05-24T16:56:27Z","modified":"2026-03-16T05:07:47Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:06:38.115187Z"}],"nvd":[{"id":"CVE-2019-16215","description":"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.","status":"published","published":"2019-09-18T12:15:10.91Z","modified":"2026-06-17T02:21:54.71Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:05:28.126831Z"}],"osv":[{"id":"CVE-2019-16215","description":"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.","status":"published","published":"2019-09-18T12:15:10.91Z","modified":"2026-10-20T10:50:46.214965539Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:11.361782Z"}]}}