HOMEVULNERABILITIESCVE-2026-42189
HIGH

CVE-2026-42189

CWE-770Published: May 8, 2026· Updated: May 14, 2026

7.5
CVSS v3.1
EPSS:0.08%probability of exploitation in 30 daysPercentile:24.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42189 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

russh_project1 product
russh
warpgate_project1 product
warpgate
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1
ADVISORYhttps://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg
ADVISORYhttps://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg

All References (4)

→
https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1Patch
→
https://github.com/Eugeny/russh/releases/tag/v0.60.1Product · Release Notes
→
https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmgExploit · Mitigation · Vendor Advisory
→
https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmgExploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-42189
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-770
CISA KEVNo
EPSS (30d)0.08%
Affected2 vendors
PublishedMay 8, 2026

Related CVEs (CWE-770)

CVE-2026-12818
9.3
CVE-2026-48854
8.7
CVE-2026-35469
8.7
CVE-2026-42786
8.7
CVE-2026-43973
8.7
CVE-2026-32145
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-42189 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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