Vulnerability Description
Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicious client can crash any russh-based server that implements keyboard-interactive auth (e.g., for 2FA/TOTP) with a single malformed packet, requiring no credentials. This issue has been patched in version 0.60.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Russh Project | Russh | < 0.60.1 |
| Warpgate Project | Warpgate | < 0.23.1 |
Related Weaknesses (CWE)
References
- https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1Patch
- https://github.com/Eugeny/russh/releases/tag/v0.60.1ProductRelease Notes
- https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmgExploitMitigationVendor Advisory
- https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmgExploitMitigationVendor Advisory
FAQ
What is CVE-2026-42189?
CVE-2026-42189 is a vulnerability with a CVSS score of 7.5 (HIGH). Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicio...
How severe is CVE-2026-42189?
CVE-2026-42189 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42189?
Check the references section above for vendor advisories and patch information. Affected products include: Russh Project Russh, Warpgate Project Warpgate.