CVE-2026-42189: high-severity vulnerability in Eugeny russh
Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Eugeny · russhRelated CVEs — Eugeny russh
In the same product, most dangerous first.
CVE-2024-43410HIGHRussh has an OOM Denial of Service due to allocation of untrusted amountEPSS 0.9%CVE-2026-73430MEDIUMRussh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)EPSS 0.6%CVE-2026-73429MEDIUMRussh: client wrong-length X25519 `clone_from_slice` panic (pre-auth DoS)EPSS 0.5%CVE-2026-73489MEDIUMRussh: Post-auth remote panic via pty-req with more than 130 terminal-mode recordsEPSS 0.5%CVE-2025-54804MEDIUMRussh is missing an overflow check during channel windows adjustEPSS 0.4%CVE-2026-68930MEDIUMRussh: Channel-scoped server callbacks can be reached without an open channelEPSS 0.4%