CVE-2026-48110 HIGH

CVE-2026-48110: Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds

Vendor Eugeny
Product russh
Weakness CWE-20 · Input validation
Published June 10, 2026
Last update June 11, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.0, several russh client and server message handlers decoded attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds. A remote SSH peer could send oversized, high-fanout, or malformed length-prefixed fields and make the library allocate, attempt to allocate, or split data before rejecting input that should have been rejected earlier. This issue has been patched in version 0.61.0.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 11, 2026 Record updated