Description
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.
Published: 2026-11-05
Score: 2.3 Low
EPSS: n/a
KEV: No
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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-j7h2-66j4-ghjf A russh SSH server accepts a publickey authentication whose signature uses a different algorithm than the one named in the request
History

Thu, 05 Nov 2026 21:00:00 +0000

Type Values Removed Values Added
Description 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.
Title A russh SSH server accepts a publickey authentication whose signature uses a different algorithm than the one named in the request
Weaknesses CWE-347
References
Metrics cvssV4_0

{'score': 2.3, 'vector': '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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-05T21:15:12.818Z

Reserved: 2026-10-15T12:47:13.665Z

Link: CVE-2026-111062

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-05T21:18:35.607

Modified: 2026-11-05T22:17:43.317

Link: CVE-2026-111062

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T22:30:17Z

Weaknesses