{"id":"CVE-2026-102820","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102820","generatedAt":"2026-10-28T03:39:53.187Z","title":"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.","description":"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.","published":"2026-09-29T19:17:24.000Z","lastModified":"2026-09-30T21:17:06.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.2,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-125","CWE-789"],"affected":[],"epss":{"score":0.00191,"percentile":0.08663,"date":"2026-10-27","history":[{"date":"2026-09-30","score":0.00129,"percentile":0.02141}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T19:17:24.000Z","detail":{"score":"6.2","severity":"MEDIUM","publishedAt":"2026-09-29T19:17:23.820Z"},"summary":"New CVE, medium severity (CVSS 6.2)."}],"references":[{"url":"https://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/releases/tag/v0.63.2","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102820","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}