high7.5
CVE-2026-42189
russh has pre-auth DoS via unbounded allocation in its keyboard-interactive auth handler
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | russh | < 0.60.1 | 0.60.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Russh Project | Russh | before 0.60.1 |
| Warpgate Project | Warpgate | before 0.23.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f5v4-2wr6-hqmg
- https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg
- https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1
- https://github.com/Eugeny/russh/releases/tag/v0.60.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-42189