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TI-2026-65514 Aliases CVE-2026-102825GHSA-g6xm-f9xp-qq35

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

Priority MEDIUM 51CWE-307Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-307.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00353 29th percentileScored 2026-11-07
Fix Fixed russh (Eugeny): 0.62.6russh (crates.io): 0.62.6Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Eugenyrusshbefore 0.62.60.62.6Patch availableCNA
—russh (crates.io)before 0.62.60.62.6Patch availableGHSA-g6xm-f9xp-qq35
  • russh VendorEugeny Affected before 0.62.6 Fixed in 0.62.6 Patch available CNA
  • russh (crates.io) Vendor— Affected before 0.62.6 Fixed in 0.62.6 Patch available GHSA-g6xm-f9xp-qq35

Remediation

  • Fix · CNA russh (Eugeny) Fixed in 0.62.6
  • Fix · GHSA-g6xm-f9xp-qq35 russh (crates.io) Fixed in 0.62.6 Advisory →

Red Hat 1 advisory

  • RHSA-2026:74586 Released 2026-10-01 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images openshell-0.1.2-0.2.hum1@aarch64, openshell-0.1.2-0.2.hum1@src, openshell-0.1.2-0.2.hum1@x86_64 +4

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:74586

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-102825
  2. 2026-10-03 Alias added: GHSA-g6xm-f9xp-qq35

References

Advisory 1

Other 4

  • TI-2026-65512 russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened CVSS 3.1HIGH 7.5
  • TI-2026-35550 Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds CVSS 3.1HIGH 7.5
  • TI-2026-34331 Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets CVSS 3.1HIGH 7.5
  • TI-2026-34308 Resource allocation without limits in Eugeny russh CVSS 3.1HIGH 7.5
  • TI-2025-16084 Tabby has a TCC Bypass via Misconfigured Node Fuses CVSS 4.0HIGH 8.6
  • TI-2024-36991 Tabby has a TCC Bypass via Unnecessary Permissive Entitlements in Tabby CVSS 4.0HIGH 8.6
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences