{"schemaVersion":3,"id":"CVE-2022-39200","aliases":["GHSA-pfw4-xjgm-267c","GO-2022-0989"],"status":"published","duplicateOf":null,"title":null,"description":"Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the `/get_missing_events` path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. `/event`, `/state`) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.","dates":{"published":"2022-09-12T20:10:09.000Z","modified":"2025-04-23T17:12:01.868Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.3,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.3,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":7.3,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":10,"impact":5.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00361,"percentile":0.28458,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.00899999999999998,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00352},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00361,"percentile":0.28458}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00352,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00361,"percentile":0.28458}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for data.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/347.html"}],"affected":[{"vendor":"github.com/matrix-org","product":"dendrite","name":"github.com/matrix-org/dendrite","label":"dendrite","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/matrix-org/dendrite","purlType":"golang","versions":[{"text":"< 0.9.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.8","eol":null,"hubHref":null},{"vendor":"matrix-org","product":"dendrite","name":"dendrite","label":"dendrite","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 0.9.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.8","eol":null,"hubHref":"/vendor/matrix-org/dendrite"},{"vendor":"matrix","product":"dendrite","name":"dendrite","label":"dendrite","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 0.9.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.8","eol":null,"hubHref":"/vendor/matrix/dendrite"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c","label":"github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory","Third Party Advisory"]},{"url":"https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3","label":"github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3","hostname":"github.com","tags":["X Refsource MISC","WEB","FIX","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-39200","label":"nvd.nist.gov/vuln/detail/CVE-2022-39200","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/matrix-org/dendrite","label":"github.com/matrix-org/dendrite","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-09-12T20:10:09.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-04-23T17:12:01.868Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T22:49:20.404Z","stale":false,"partial":false}}