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CVE-2026-42189

30
FAUCET Score

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.

First published: May 8, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.60.1CPE matchmatch criteria
cpe:2.3:a:russh_project:russh:*:*:*:*:*:rust:*:*
< 0.23.1CPE matchmatch criteria
cpe:2.3:a:warpgate_project:warpgate:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.48%
Probability of exploitation in next 30 days
EPSS Percentile
38.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0048 is in the 17th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: russhFixed in: 0.60.1

Vendor Advisories (1)

rustGHSA-f5v4-2wr6-hqmghigh

russh has pre-auth DoS via unbounded allocation in its keyboard-interactive auth handler

Apr 24, 2026

References

github.com / Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1
Patch
github.com / Eugeny/russh/releases/tag/v0.60.1
ProductRelease Notes
github.com / Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg
ExploitMitigationVendor Advisory