---
id: CVE-2026-102825
title: Russh is a Rust SSH client and server library
summary: >-
  Russh is a Rust SSH client and server library. Prior to 0.62.6, the
  USERAUTH_REQUEST path reached from server::run_stream in
  russh/src/server/encrypted.rs increments self.common.auth_attempts but never
  compares it with server::Config.max…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-307
vendor: Eugeny
product: russh
affected:
  - russh < 0.62.6
published: '2026-09-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T20:17:24.100'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102825'
references:
  - url: >-
      https://github.com/Eugeny/russh/commit/f8fd0b11a393364dc7f01a182482d86adafdd653
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/releases/tag/v0.62.6'
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35'
    label: security-advisories@github.com
  - url: 'https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102825'
  - url: 'https://github.com/advisories/GHSA-g6xm-f9xp-qq35'
  - url: 'https://github.com/Eugeny/russh'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102825.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102825'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543507'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-102825'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74586'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - rust
  - osv
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T19:29:11.461462Z'
epss: 0.00353
epssPercentile: 0.29074
ingestedAt: '2026-09-29T19:44:04.148Z'
aliases:
  - GHSA-g6xm-f9xp-qq35
ecosystem: rust
patched:
  - russh 0.62.6
---

## Overview

Russh is a Rust SSH client and server library. Prior to 0.62.6, the USERAUTH_REQUEST path reached from server::run_stream in russh/src/server/encrypted.rs increments self.common.auth_attempts but never compares it with server::Config.max_auth_attempts. An unauthenticated remote client can continue submitting authentication requests on one connection beyond the configured cap, bypassing the deployment's attempt-limiting policy and increasing online guessing opportunity and backend authentication workload. This issue is fixed in version 0.62.6.

## Remediation

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

## Package advisory (CVE-2026-102825)

Affected packages:

- `russh <= 0.62.5`

Patched in:

- `russh 0.62.6`

Source: https://github.com/advisories/GHSA-g6xm-f9xp-qq35

## Vendor advisories

- **RHSA-2026:74586** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74586)