CVE-2026-128088

russh 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.

• CWE-367
• CWE-863

• https://github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184c
• https://github.com/Eugeny/russh/pull/808
• https://github.com/Eugeny/russh/releases/tag/v0.65.1
• https://github.com/Eugeny/russh/security/advisories/GHSA-736f-c93q-9fwx

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Deferred

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