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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68930
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-03 17:16:44 UTC
Updated2026-08-03 17:16:44 UTC
DescriptionRussh 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Eugeny Russh affected < 0.62.5 Not specified

References

ReferenceSourceLinkTags
github.com/Eugeny/russh/commit/7c5659f8cf6f6f2f9989d12dba0ebf49dc50a171 [email protected] github.com
github.com/Eugeny/russh/security/advisories/GHSA-m65r-rprj-r5rg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/Eugeny/russh/releases/tag/v0.62.5 [email protected] github.com
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