{"id":"UBUNTU-CVE-2026-102823","details":"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.","modified":"2026-10-17T12:57:56.054809267Z","published":"2026-09-29T19:17:00Z","upstream":["CVE-2026-102823"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-102823"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-102823"},{"type":"REPORT","url":"https://github.com/Eugeny/russh/security/advisories/GHSA-47hw-gvq5-r2gm"},{"type":"REPORT","url":"https://github.com/Eugeny/russh/commit/3430fd26ecafc0dc3705210f5f39a9119fa22774"},{"type":"REPORT","url":"https://github.com/Eugeny/russh/releases/tag/v0.63.1"}],"affected":[{"package":{"name":"rust-russh","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-russh?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.57.1-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.57.1-2","binary_name":"librust-russh-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102823.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}