{"schemaVersion":3,"id":"CVE-2026-44467","aliases":[],"status":"published","duplicateOf":null,"title":"Claude Desktop: SSH Host Key Verification Bypass Allows Man-in-the-Middle Attack on Remote Sessions","description":"The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side. From 1.2581.0 to before 1.4304.0, Claude Desktop's SSH remote development feature verified only whether a hostname existed in ~/.ssh/known_hosts without comparing the server's presented host key against the stored key. This allowed a network-positioned attacker to present an arbitrary SSH host key and have the connection silently accepted, enabling a man-in-the-middle attack on remote development sessions. Successful exploitation required the attacker to be in a network position to intercept SSH traffic (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) and the target hostname to already have an entry in the victim's known_hosts file. This vulnerability is fixed in 1.4304.0.","dates":{"published":"2026-05-13T15:40:42.216Z","modified":"2026-05-14T18:29:10.605Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.4,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.4,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":7.4,"severity":"high","vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00218,"percentile":0.11584,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.083,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00135},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00218,"percentile":0.11584}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00135,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00218,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00218,"percentile":0.11584}]},"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-297","name":"Improper Validation of Certificate with Host Mismatch","description":"The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.","type":"weakness","status":"Incomplete","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/297.html"},{"id":"CWE-322","name":"Key Exchange without Entity Authentication","description":"The product performs a key exchange with an actor without verifying the identity of that actor.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/322.html"}],"affected":[{"vendor":"anthropic","product":"claude_desktop","name":"claude desktop","label":"claude_desktop","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.2581.0, < 1.4304.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.2581.0, < 1.4304.0","eol":null,"hubHref":"/vendor/anthropic/claude_desktop"},{"vendor":"anthropics","product":"claude-code","name":"claude-code","label":"claude-code","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.2581.0, < 1.4304.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.2581.0, < 1.4304.0","eol":null,"hubHref":"/vendor/anthropics/claude-code"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/anthropics/claude-code/security/advisories/GHSA-3rwf-2g6p-c2f9","label":"github.com/anthropics/claude-code/security/advisories/GHSA-3rwf-2g6p-c2f9","hostname":"github.com","tags":["X Refsource CONFIRM","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-05-13T15:40:42.216Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-14T18:29:10.605Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T21:13:21.463Z","stale":false,"partial":false}}