{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102820", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-29T17:25:25.264Z", "datePublished": "2026-09-29T18:18:43.297Z", "dateUpdated": "2026-09-30T20:11:08.453Z"}, "containers": {"cna": {"title": "pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-789", "lang": "en", "description": "CWE-789: Memory Allocation with Excessive Size Value", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm"}, {"name": "https://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b", "tags": ["x_refsource_MISC"], "url": "https://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b"}, {"name": "https://github.com/Eugeny/russh/releases/tag/v0.63.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/Eugeny/russh/releases/tag/v0.63.2"}], "affected": [{"vendor": "Eugeny", "product": "russh", "versions": [{"version": "< 0.63.2", "status": "affected"}]}, {"vendor": "rust", "product": "pageant", "versions": [{"version": "< 0.2.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-29T18:18:43.297Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-g4mp-vgx3-xrvm", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-30T20:11:00.619637Z", "id": "CVE-2026-102820", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-30T20:11:08.453Z"}}]}}

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{"bugzilla": {"description": "pageant: pageant: Denial of Service via untrusted response length in shared memory", "id": "2543500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543500"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in pageant. On Windows, the component fails to properly validate the response length received through shared memory when communicating with an authentication agent. A local attacker impersonating the agent can supply a manipulated length value, triggering an oversized memory allocation and an out-of-bounds memory read. This can lead to a Denial of Service (DoS) by crashing the client application and may potentially result in information disclosure."], "name": "CVE-2026-102820", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openshell", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-29T18:18:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-102820\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-102820\nhttps://github.com/Eugeny/russh/commit/5d566989ebabfdebfe6b33243d31765a0812260b\nhttps://github.com/Eugeny/russh/releases/tag/v0.63.2\nhttps://github.com/Eugeny/russh/security/advisories/GHSA-g4mp-vgx3-xrvm"], "threat_severity": "Moderate"}

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