---
id: CVE-2026-111062
title: >-
  A russh SSH server accepts a publickey authentication whose signature uses a
  different algorithm than the one named in the request
summary: >-
  russh is a Rust SSH client and server library. From version 0.34.0-beta.1
  until version 0.64.0, its SSH server does not require the signature algorithm
  in a public-key authentication signature to match the algorithm named in the
  authenti…
severity: low
cvss: 2.3
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-347
vendor: Eugeny
product: russh
affected:
  - 'russh >= 0.34.0-beta.1, < 0.64.0'
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:14:57.282714Z'
exploitAvailable: true
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:15:12.818Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111062'
references:
  - url: 'https://github.com/Eugeny/russh/security/advisories/GHSA-j7h2-66j4-ghjf'
    label: 'https://github.com/Eugeny/russh/security/advisories/GHSA-j7h2-66j4-ghjf'
  - url: 'https://github.com/Eugeny/russh/pull/759'
    label: 'https://github.com/Eugeny/russh/pull/759'
  - url: >-
      https://github.com/Eugeny/russh/commit/a0ded76bdc352f8fbeaaeb175fb2a0c586fbc8f2
    label: >-
      https://github.com/Eugeny/russh/commit/a0ded76bdc352f8fbeaaeb175fb2a0c586fbc8f2
  - url: 'https://github.com/Eugeny/russh/releases/tag/v0.64.0'
    label: 'https://github.com/Eugeny/russh/releases/tag/v0.64.0'
  - url: 'https://github.com/Eugeny/russh'
  - url: 'https://github.com/advisories/GHSA-j7h2-66j4-ghjf'
tags:
  - cve.org
  - exploit-available
  - osv
  - rust
  - ghsa
aliases:
  - GHSA-j7h2-66j4-ghjf
ecosystem: rust
patched:
  - russh 0.64.0
ingestedAt: '2026-10-19T17:33:42.442Z'
---

## Overview

russh is a Rust SSH client and server library. From version 0.34.0-beta.1 until version 0.64.0, its SSH server does not require the signature algorithm in a public-key authentication signature to match the algorithm named in the authentication request. A client possessing an authorized RSA private key can announce  rsa-sha2-512  while supplying a valid  ssh-rsa  SHA-1 signature, bypassing restrictions or producing misleading audit records when applications rely on the requested algorithm. A valid private-key signature remains required, and russh clients are not affected. This issue is fixed in version 0.64.0.

## Affected

- `russh >= 0.34.0-beta.1, < 0.64.0`

## Remediation

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

## Package advisory (CVE-2026-111062)

Affected packages:

- `russh >= 0.34.0-beta.1, < 0.64.0`

Patched in:

- `russh 0.64.0`

Source: https://osv.dev/vulnerability/GHSA-j7h2-66j4-ghjf