CVE-2026-48108 Details
Description
Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, russh did not enforce the SSH identification-string rules as deliberately as OpenSSH. In particular, the server-side identification reader used the same permissive path as the client, allowing pre-banner lines from clients, and the reader did not enforce a bounded number of pre-banner lines. For a library server built on russh, this could allow a remote peer to hold connection setup resources in the cleartext pre-authentication phase with malformed identification input that should have been rejected early. This issue has been patched in version 0.61.0.
A vulnerability exists in the Russh SSH client and server library, specifically in versions 0.34.0-beta.1 prior to 0.61.0. The issue arises because Russh did not enforce SSH identification-string rules as strictly as OpenSSH. The server-side identification reader accepted non-canonical client banners and failed to limit pre-banner input, allowing remote peers to misuse connection setup resources during the cleartext pre-authentication phase. This could be done by sending malformed identification that should have been rejected early. The vulnerability has been patched in version 0.61.0.
Users can update to Russh version 0.61.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 10, 2026CISA-ADP
Assessed Jun 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Eugeny/russh/security/advisories/GHSA-76r6-x97p-67vr | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Eugeny/russh/security/advisories/GHSA-76r6-x97p-67vr | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Eugeny russh | >= 0.34.0-beta.1, < 0.61.0 (semver) |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 11, 2026 | CVE Modified | CISA-ADP |
| Jun 10, 2026 | New CVE Received | [email protected] |