{"id":"CVE-2018-21018","aliases":["EUVD-2018-13542","GHSA-4gqg-m5mw-g8mg"],"status":"published","title":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02561,"percentile":0.85218,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-613"],"published":"2019-09-22T14:22:43Z","modified":"2026-10-20T10:50:31Z","products":[{"vendor":"joinmastodon","product":"mastodon"}],"references":[{"url":"https://github.com/tootsuite/mastodon/releases/tag/v2.6.2","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://github.com/tootsuite/mastodon/releases/tag/v2.6.3","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://github.com/tootsuite/mastodon/pull/9329","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/tootsuite/mastodon/pull/9381","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-21018"},{"url":"https://github.com/advisories/GHSA-4gqg-m5mw-g8mg"}],"sources":{"cve":[{"id":"CVE-2018-21018","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","status":"published","published":"2019-09-22T14:22:43Z","modified":"2024-08-05T12:19:27.18Z","updated_at":"2026-11-02T14:35:02.289647Z"}],"euvd":[{"id":"EUVD-2018-13542","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","status":"published","published":"2019-09-22T14:22:43Z","modified":"2024-08-05T12:19:27Z","updated_at":"2026-11-03T02:39:28.765449Z"}],"ghsa":[{"id":"GHSA-4gqg-m5mw-g8mg","title":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","status":"published","published":"2022-05-24T16:56:38Z","modified":"2024-04-04T01:59:08Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-613"],"updated_at":"2026-11-02T14:56:05.019773Z"}],"nvd":[{"id":"CVE-2018-21018","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","status":"published","published":"2019-09-22T15:15:13.657Z","modified":"2026-06-17T01:53:58Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-613"],"updated_at":"2026-11-02T14:04:59.278647Z"}],"osv":[{"id":"CVE-2018-21018","description":"Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.","status":"published","published":"2019-09-22T15:15:13.657Z","modified":"2026-10-20T10:50:31.581095793Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:09.145458Z"}]}}