UBUNTU-CVE-2026-111062 (CVE-2026-111062)

Vulnerability from osv_ubuntu – Published: 2026-11-06 00:00 – Updated: 2026-11-06 00:00 – Source website
VLAI
Details

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.

Severity
2.3 (Low)
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
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-russh-dev",
            "binary_version": "0.57.1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "rust-russh",
        "purl": "pkg:deb/ubuntu/rust-russh@0.57.1-2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.57.1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "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 \u00a0rsa-sha2-512\u00a0 while supplying a valid \u00a0ssh-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.",
  "id": "UBUNTU-CVE-2026-111062",
  "modified": "2026-11-06T00:00:00Z",
  "published": "2026-11-06T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-111062"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-111062"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Eugeny/russh/commit/a0ded76bdc352f8fbeaaeb175fb2a0c586fbc8f2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Eugeny/russh/pull/759"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Eugeny/russh/releases/tag/v0.64.0"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-j7h2-66j4-ghjf"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-111062"
  ]
}



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