Description
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.
Published: 2026-09-29
Score: 3.7 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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History

Tue, 29 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path
Weaknesses CWE-307
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-29T18:31:32.393Z

Reserved: 2026-09-29T17:25:25.265Z

Link: CVE-2026-102825

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-29T19:17:24.713

Modified: 2026-09-29T19:17:24.847

Link: CVE-2026-102825

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-307

    Improper Restriction of Excessive Authentication Attempts