russh try_sign: asynchronous confirmation can sign after agent lock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128088
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 19:19:31 UTC
Updated2026-11-13 19:19:31 UTC
Descriptionrussh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to version 0.65.1, try_sign() captures an Arc<PrivateKey> before awaiting Agent::confirm() and does not revalidate the shared lock state or key presence after the await. This is a distinct residual defect in the remediation for CVE-2026-116794. A peer, including a remote SSH server using agent forwarding, can begin a confirmation-constrained signature request while the agent is unlocked and receive the signature after another connection locks the agent if the stale confirmation returns true. New post-lock requests are rejected and private key material is not disclosed, but the pending operation bypasses the current lock state. This issue is fixed in version 0.65.1.

Risk And Classification

Primary CVSS: v3.1 2.2 LOW from [email protected]

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

Problem Types: CWE-367 | CWE-863 | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.2LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED2.2LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Eugeny Russh affected >= 0.65.0, < 0.65.1 Not specified

References

ReferenceSourceLinkTags
github.com/Eugeny/russh/security/advisories/GHSA-736f-c93q-9fwx [email protected] github.com
github.com/Eugeny/russh/pull/808 [email protected] github.com
github.com/Eugeny/russh/releases/tag/v0.65.1 [email protected] github.com
github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184c [email protected] github.com
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