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CVE-2026-102825— Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path

Quick assessment

Affected
Eugeny russh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 unau

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-102825

Vulnerability Information

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Vulnerability Title
Russh: Configured server auth-attempt cap is not enforced in the USERAUTH_REQUEST runtime path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eugeny russh < 0.62.6 -

II. Public POCs for CVE-2026-102825

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III. Intelligence Information for CVE-2026-102825

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Other References for CVE-2026-102825 (3)

Same Patch Batch · Eugeny · 2026-09-29 · 6 CVEs total

CVE-2026-102823 7.5 HIGH russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never
CVE-2026-102821 6.5 MEDIUM Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey
CVE-2026-102820 6.2 MEDIUM pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a mali
CVE-2026-102824 4.3 MEDIUM Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
CVE-2026-102822 3.7 LOW russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-ind

IV. Related Vulnerabilities

Same product: russh
Same vendor: Eugeny
Same weakness: CWE-307

V. Comments for CVE-2026-102825

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