{"id":"CVE-2026-102823","revision":"941fbd7f7185404f9b1a5cbdcd9e4b17","records":[{"revision":"941fbd7f7185404f9b1a5cbdcd9e4b17","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102823","aliases":[],"title":"russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened","description":"Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHANNEL_REQUEST subtypes exit-status, exit-signal, and xon-xoff to public client::Handler callbacks without confirming that the ChannelId belongs to a channel the client opened and established. A malicious SSH server can send lifecycle events for predicted, unopened, unconfirmed, or released channel identifiers, causing application panics or corrupting command completion and exit-code tracking. This issue is fixed in version 0.63.1.","state":0,"publishedAt":"2026-09-29T18:25:58.084+00:00","modifiedAt":"2026-10-02T12:20:10.605+00:00","affected":[{"ecosystem":"Vendor product","name":"russh","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Eugeny\",\n                    \"product\": \"russh\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.63.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/Eugeny/russh/security/advisories/GHSA-47hw-gvq5-r2gm","https://github.com/Eugeny/russh/commit/3430fd26ecafc0dc3705210f5f39a9119fa22774","https://github.com/Eugeny/russh/releases/tag/v0.63.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102823","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102823","identifiers":["CVE-2026-102823"]},"retained":false,"historicalAffected":[]}],"coverage":[]}