---
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
vendor: Eugeny
product: russh
affected:
  - russh < 0.63.1
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T19:17:24.503'
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
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T18:42:35.835Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.