{"schema_version":"1","data":[{"id":4893,"advisory_id":"e9658bb4-7180-4ede-b23c-04dbab46649e","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-102820","source_published_at":"2026-09-29T18:18:43.297+00:00","published_at":"2026-10-24T21:59:18.325343+00:00","extraction_method":"structured","technologies":["core-cve","pageant","russh"],"cve_ids":["CVE-2026-102820"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)","summary":"pageant provides a [PageantStream] type that implements [AsyncRead] and [AsyncWrite] traits and can be used to talk to a running Pageant instance. Prior to pageant 0.2.3, the Windows pageant crate's pageant/src/wmmessage.rs MemoryMap::read function trusts a peer-controlled u32 response length supplied through the 8192-byte Pageant shared-memory mapping reached by AgentClient::connect_pageant. A local process that impersonates the Pageant window can make query_pageant_direct allocate up to approximately 4 GiB and copy beyond the mapped view, reliably crashing a russh client and conditionally exposing adjacent committed memory. This issue is fixed in pageant 0.2.3.","evidence":"cve:CVE-2026-102820","products":[{"name":{"value":"russh","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]},{"name":{"value":"pageant","evidence":"/containers/cna/affected/1/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-102820","aliases":["CVE-2026-102820"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.2,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"vendor":"Eugeny","product":"russh","versions":[{"status":"affected","version":"< 0.63.2"}]},{"vendor":"rust","product":"pageant","versions":[{"status":"affected","version":"< 0.2.3"}]}],"modified":"2026-09-30T20:11:08.453Z","provider":"cve","references":["https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm","https://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b","https://github.com/Eugeny/russh/releases/tag/v0.63.2"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-102820","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-30T20:11:00.619637Z"}}}],"references":[{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-30T20:11:08.453Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-29T18:18:43.297Z"}}},"related_cves":[{"value":"CVE-2026-102820","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"}}],"next_after":4893,"next_before":4893}