CVE-2026-128088
russh try_sign: asynchronous confirmation can sign after agent lock
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.
Fixes and workarounds
Fix
russh (crates.io): OSV reports a fixed version 0.65.1. Check the advisory for supported release branches.
Source: OSV GHSA-736f-c93q-9fwxAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| russh Eugeny |
>= 0.65.0, < 0.65.1 (affected) | CNA: GitHub_M |
russhrussh
crates.io |
0.65.0 (affected, crates.io) ≥ 0.65.0; < 0.65.1 (affected, semver); OSV events: introduced 0.65.0; fixed 0.65.1 Source events (semver)Other versions: unaffected |
OSV GHSA-736f-c93q-9fwx |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 2.2 low |
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/Eugeny/russh/security/advisories/GHSA-736f-c93q-9fwxCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/Eugeny/russh/pull/808CNA: GitHub_M · x_refsource_MISC
- https://github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184cCNA: GitHub_M · x_refsource_MISC
- https://github.com/Eugeny/russh/releases/tag/v0.65.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-736f-c93q-9fwxOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-736f-c93q-9fwxOSV / GitHub Security Advisories · osv
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