High severity7.5NVD Advisory· Published May 8, 2026· Updated May 14, 2026
CVE-2026-42189
CVE-2026-42189
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
russhcrates.io | < 0.60.1 | 0.60.1 |
Affected products
5- osv-coords3 versions
< 26.5.6-r0+ 2 more
- (no CPE)range: < 26.5.6-r0
- (no CPE)range: < 26.5.6-r0
- (no CPE)range: < 0.60.1
Patches
Vulnerability mechanics
References
5- github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1nvdPatchWEB
- github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmgnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-f5v4-2wr6-hqmgghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42189ghsaADVISORY
- github.com/Eugeny/russh/releases/tag/v0.60.1nvdProductRelease NotesWEB
News mentions
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