Keyboard-Interactive Authentication Vulnerability in Russh Client by Eugeny
CVE-2026-48107

6.5MEDIUM

Key Information:

Vendor

Eugeny

Status
Russh
Vendor
CVE Published:
10 June 2026

What is CVE-2026-48107?

The Russh client, a Rust-based SSH library, has a vulnerability in its keyboard-interactive authentication handling. Malicious SSH servers can exploit this flaw by sending a USERAUTH_INFO_REQUEST with a manipulated prompt count. This can lead to improper use of raw count values in the Vec::with_capacity function without adequate validation of the corresponding prompt data in the packet. The issue has been resolved in Russh version 0.61.0.

Affected Version(s)

russh >= 0.37.0, < 0.61.0

References

https://github.com/Eugeny/russh/security/advisories/GHSA-...
x_refsource_CONFIRM

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.