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CVE-2026-42189: Russh is a Rust SSH client & server library

47
This week
HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2026-42189 is a high-severity flaw (CVSS 7.5) affecting russh, warpgate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 59%)
CISA exploited listNo
WeaknessCWE-770, CWE-789
Published2026-05-08
Last modified2026-10-26
Publisher (CNA): GitHub, Inc. · Vendor: russh project · warpgate project

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Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

russh project russh UPGRADE
Affected: < 0.60.1
Fixed in: 0.60.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy russh || rpm -q russh || russh --version
2. UPGRADE to 0.60.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade russh
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade russh
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
warpgate project warpgate UPGRADE
Affected: < 0.23.1
Fixed in: 0.23.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy warpgate || rpm -q warpgate || warpgate --version
2. UPGRADE to 0.23.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade warpgate
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade warpgate
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42189?

russh: upgrade to 0.60.1; warpgate: upgrade to 0.23.1. Exact commands for each OS are on this page.

Is CVE-2026-42189 being exploited?

CVE-2026-42189 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42189 affect?

CVE-2026-42189 affects russh, warpgate. Severity is high (CVSS 7.5). 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 serv

How urgent is CVE-2026-42189?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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