{"id":"CVE-2026-102823","title":"Russh is a Rust SSH client and server library","summary":"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, C…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-20","CWE-841"],"vendor":"Eugeny","product":"russh","affected":["russh < 0.63.1"],"patched":["russh 0.63.1"],"published":"2026-09-29","updated":"2026-10-02","sourceUpdated":"2026-10-02T13:17:25.650","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102823","references":[{"url":"https://github.com/Eugeny/russh/commit/3430fd26ecafc0dc3705210f5f39a9119fa22774","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/releases/tag/v0.63.1","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-47hw-gvq5-r2gm","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-47hw-gvq5-r2gm","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102823.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-102823"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543503"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102823"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102823"},{"url":"https://github.com/advisories/GHSA-47hw-gvq5-r2gm"},{"url":"https://github.com/Eugeny/russh"},{"url":"https://access.redhat.com/errata/RHSA-2026:74586"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","ghsa","rust","osv"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-02T12:19:44.206468Z"},"epss":0.00317,"epssPercentile":0.24482,"aliases":["GHSA-47hw-gvq5-r2gm"],"ecosystem":"rust","ingestedAt":"2026-09-29T18:42:35.835Z","slug":"CVE-2026-102823","body":"## Overview\n\nRussh 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-102823)\n\nAffected packages:\n\n- `russh <= 0.63.0`\n\nPatched in:\n\n- `russh 0.63.1`\n\nSource: https://github.com/advisories/GHSA-47hw-gvq5-r2gm\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102823.json)\n- **RHSA-2026:74586** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74586)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":214901,"id":"CVE-2026-102823","ts":1790947193596,"field":"exploit_available","old":"false","new":"true"}]}