{"api_version":"1","generated_at":"2026-11-13T21:06:10+00:00","cve":"CVE-2026-128088","urls":{"html":"https://cve.report/CVE-2026-128088","api":"https://cve.report/api/cve/CVE-2026-128088.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-128088","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-128088"},"summary":{"title":"russh try_sign: asynchronous confirmation can sign after agent lock","description":"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. 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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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":2.2,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-13T19:07:42.568Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/Eugeny/russh/security/advisories/GHSA-736f-c93q-9fwx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-736f-c93q-9fwx"},{"name":"https://github.com/Eugeny/russh/pull/808","tags":["x_refsource_MISC"],"url":"https://github.com/Eugeny/russh/pull/808"},{"name":"https://github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184c","tags":["x_refsource_MISC"],"url":"https://github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184c"},{"name":"https://github.com/Eugeny/russh/releases/tag/v0.65.1","tags":["x_refsource_MISC"],"url":"https://github.com/Eugeny/russh/releases/tag/v0.65.1"}],"source":{"advisory":"GHSA-736f-c93q-9fwx","discovery":"UNKNOWN"},"title":"russh try_sign: asynchronous confirmation can sign after agent lock"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-128088","datePublished":"2026-11-13T19:07:42.568Z","dateReserved":"2026-11-12T21:24:51.131Z","dateUpdated":"2026-11-13T19:07:42.568Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-13 19:19:31","lastModifiedDate":"2026-11-13 19:19:31","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"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N","baseScore":2.2,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":0.8,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"128088","Ordinal":"1","Title":"russh try_sign: asynchronous confirmation can sign after agent l","CVE":"CVE-2026-128088","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"128088","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"russh try_sign: asynchronous confirmation can sign after agent l"}]}}}