{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116774", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-26T21:53:35.166Z", "datePublished": "2026-10-27T20:25:26.914Z", "dateUpdated": "2026-10-27T20:25:26.914Z"}, "containers": {"cna": {"title": "russh: peer-declared zero maximum packet size permanently stalls channel writes (silent AsyncWrite hang)", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-835", "lang": "en", "description": "CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/Eugeny/russh/security/advisories/GHSA-fw5c-8223-6h42", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-fw5c-8223-6h42"}, {"name": "https://github.com/Eugeny/russh/commit/39cb9dbaa37caf555d34c6c22efa3bbbff9e186c", "tags": ["x_refsource_MISC"], "url": "https://github.com/Eugeny/russh/commit/39cb9dbaa37caf555d34c6c22efa3bbbff9e186c"}, {"name": "https://github.com/Eugeny/russh/releases/tag/v0.65.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/Eugeny/russh/releases/tag/v0.65.0"}], "affected": [{"vendor": "Eugeny", "product": "russh", "versions": [{"version": ">= 0.60.0, < 0.65.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-27T20:25:26.914Z"}, "descriptions": [{"lang": "en", "value": "russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0."}], "source": {"advisory": "GHSA-fw5c-8223-6h42", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "russh", "vendor": "Eugeny", "versions": [{"status": "affected", "version": ">= 0.60.0, < 0.65.0"}]}], "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 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0."}], "id": "CVE-2026-116774", "lastModified": "2026-10-27T21:18:06.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-27T21:18:05.933", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/commit/39cb9dbaa37caf555d34c6c22efa3bbbff9e186c"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/releases/tag/v0.65.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-fw5c-8223-6h42"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-835"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}