---
id: CVE-2026-73489
title: Russh is a Rust SSH client & server library
summary: >-
  Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated
  SSH client can cause a denial of service by sending a pty-req channel request
  with more than 130 terminal-mode records. The parser in
  russh/src/server/encrypt…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-129
vendor: russh
product: russh
affected:
  - russh < 0.62.4
patched:
  - russh 0.62.4
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73489'
references:
  - url: >-
      https://github.com/Eugeny/russh/commit/8912512371820167a12a0a638bd666856ce458ad
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/releases/tag/v0.62.4'
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq'
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/security/advisories/GHSA-cqjc-rmpq-xprq'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/Eugeny/russh'
tags:
  - nvd
  - osv
  - rust
epss: 0.00451
epssPercentile: 0.36452
aliases:
  - GHSA-cqjc-rmpq-xprq
ecosystem: rust
ingestedAt: '2026-08-13T19:18:22.058Z'
---

## Overview

Russh is a Rust SSH client & server library. Prior to 0.62.4, an authenticated SSH client can cause a denial of service by sending a pty-req channel request with more than 130 terminal-mode records. The parser in russh/src/server/encrypted.rs stores terminal modes in a fixed 130-entry [(Pty::TTY_OP_END, 0); 130] array but continues increasing the mode count, then constructs an out-of-bounds slice and panics before the application pty_request handler runs. The panic terminates the server session task without causing memory corruption. This issue is fixed in version 0.62.4.

## Remediation

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

## Package advisory (CVE-2026-73489)

Affected packages:

- `russh < 0.62.4`

Patched in:

- `russh 0.62.4`

Source: https://osv.dev/vulnerability/GHSA-cqjc-rmpq-xprq