PT-2026-48546 · Eugeny · Russh

Published 2026-06-10 · Updated 2026-06-10 · CVE-2026-48108

Mitre

CVSS v3.1

5.3

Medium

Base vector

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

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-48108

Affected Products

Russh

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-48108 · Security Note
• https://github.com/Eugeny/russh/security/advisories/GHSA-76r6-x97p-67vr · Note