{"schema_version":"1","data":[{"id":4843,"advisory_id":"0f44f688-9347-477d-9180-32b9810b34cd","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102821","source_published_at":"2026-09-29T18:21:21.858+00:00","published_at":"2026-10-24T21:58:48.94704+00:00","extraction_method":"structured","technologies":["core-cve","russh"],"cve_ids":["CVE-2026-102821"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey","summary":"Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.","evidence":"cve:CVE-2026-102821","products":[{"name":{"value":"russh","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-102821","aliases":["CVE-2026-102821"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.5,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}}],"affected":[{"vendor":"Eugeny","product":"russh","versions":[{"status":"affected","version":"< 0.63.2"}]}],"modified":"2026-09-30T19:35:02.962Z","provider":"cve","references":["https://github.com/Eugeny/russh/security/advisories/GHSA-35g8-35p8-c8fw","https://github.com/Eugeny/russh/commit/a282af361ac99bc76b80876d1aae128e89dbf66b","https://github.com/Eugeny/russh/releases/tag/v0.63.2"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-102821","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-30T19:34:47.748081Z"}}}],"references":[{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-35g8-35p8-c8fw","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-30T19:35:02.962Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-29T18:21:21.858Z"}}},"related_cves":[{"value":"CVE-2026-102821","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"}}],"next_after":4843,"next_before":4843}