What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-29 · updated 2026-09-30
• Weakness: CWE-307

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.

Affected products

• Eugeny russh: before 0.62.6

References

• https://github.com/Eugeny/russh/commit/f8fd0b11a393364dc7f01a182482d86adafdd653
• https://github.com/Eugeny/russh/releases/tag/v0.62.6
• https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35
• https://github.com/Eugeny/russh/security/advisories/GHSA-g6xm-f9xp-qq35

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