CVE-2026-128087

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-128087", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-12T21:24:51.131Z", "datePublished": "2026-11-13T19:03:26.702Z", "dateUpdated": "2026-11-13T19:03:26.702Z"}, "containers": {"cna": {"title": "russh kex_done: shared-secret callback runs before server host-key verification", "problemTypes": [{"descriptions": [{"cweId": "CWE-696", "lang": "en", "description": "CWE-696: Incorrect Behavior Order", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/Eugeny/russh/security/advisories/GHSA-9264-jvgf-6w2f", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-9264-jvgf-6w2f"}, {"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"}], "affected": [{"vendor": "Eugeny", "product": "russh", "versions": [{"version": ">= 0.55.0, < 0.65.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-13T19:03:26.702Z"}, "descriptions": [{"lang": "en", "value": "russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From version 0.55.0 until version 0.65.1, the initial key exchange invokes client::Handler::kex_done() with the raw shared secret before check_server_key() accepts the server host key or certificate. A malicious SSH server can therefore trigger application-defined secondary-channel initialization or early data handling even when the server identity is subsequently rejected. Ordinary clients that keep the callback's no-op default or independently defer callback-derived actions until trust is confirmed are not affected. This issue is fixed in version 0.65.1."}], "source": {"advisory": "GHSA-9264-jvgf-6w2f", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "russh", "vendor": "Eugeny", "versions": [{"status": "affected", "version": ">= 0.55.0, < 0.65.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From version 0.55.0 until version 0.65.1, the initial key exchange invokes client::Handler::kex_done() with the raw shared secret before check_server_key() accepts the server host key or certificate. A malicious SSH server can therefore trigger application-defined secondary-channel initialization or early data handling even when the server identity is subsequently rejected. Ordinary clients that keep the callback's no-op default or independently defer callback-derived actions until trust is confirmed are not affected. This issue is fixed in version 0.65.1."}], "id": "CVE-2026-128087", "lastModified": "2026-11-13T19:19:31.600", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T19:19:31.477", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/commit/43a46d67a80a7355fcd2fb25e7e00d79aec8184c"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/pull/808"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/releases/tag/v0.65.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-9264-jvgf-6w2f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-696"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}