CVE-2026-68930

Russh: Channel-scoped server callbacks can be reached without an open channel

State: Published
Severity: 6.5 Medium
Published: Aug 3, 2026
Updated: Aug 3, 2026
Reserved: Jul 31, 2026

Description

Russh is a Rust SSH client & server library. Prior to 0.62.5, russh dispatches channel-scoped Handler callbacks for recipient channel IDs that were never opened or confirmed in russh/src/server/encrypted.rs, server_read_authenticated, and the exec_request callback. Version 0.62.5 fixes the issue.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	GitHub_M

Weaknesses

CWE-666 Operation on Resource in Wrong Phase of Lifetime
CWE-696 Incorrect Behavior Order
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
russhEugeny	< 0.62.5Affected

References

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