{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97631", "assignerOrgId": "65518388-201a-4f93-8712-366d21fe8d2c", "state": "PUBLISHED", "assignerShortName": "TianoCore", "dateReserved": "2026-09-24T16:56:45.359Z", "datePublished": "2026-10-22T16:32:27.619Z", "dateUpdated": "2026-10-22T16:37:13.437Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "65518388-201a-4f93-8712-366d21fe8d2c", "shortName": "TianoCore", "dateUpdated": "2026-10-22T16:37:13.437Z"}, "title": "Pre-boot RCE in EDK II PXE driver", "datePublic": "2026-10-22T16:32:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-120", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-131", "description": "CWE-131 Incorrect calculation of buffer size", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds write", "type": "CWE"}]}], "affected": [{"vendor": "TianoCore", "product": "EDK2", "packageName": "NetworkPkg", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "edk2-stable202608", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "EDK2 contains a vulnerability in BIOS where a user may cause \u201cOut-of-bounds\nWrite\u201d, Classic\nBuffer Overflow, and \u201cIncorrect Calculation of Buffer Size\u201d by remote access. Successful exploitation of this vulnerability\ncan lead to arbitrary\ncode execution. It could also impact\nConfidentiality,\nIntegrity,\nand Availability.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>EDK2 contains a vulnerability in BIOS where a user may cause \u201cOut-of-bounds\nWrite\u201d, Classic\nBuffer Overflow, and \u201cIncorrect Calculation of Buffer Size\u201d by remote access. Successful exploitation of this vulnerability\ncan lead to arbitrary\ncode execution. It could also impact\nConfidentiality,\nIntegrity,\nand Availability.</p>"}]}], "references": [{"url": "https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.5, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}}], "credits": [{"lang": "en", "value": "Alex Matrosov (Anthropic)", "type": "finder"}, {"lang": "en", "value": "Dan Holmes-Mitra (Google)", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageName": "NetworkPkg", "product": "EDK2", "vendor": "TianoCore", "versions": [{"lessThanOrEqual": "edk2-stable202608", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "infosec@edk2.groups.io"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "EDK2 contains a vulnerability in BIOS where a user may cause \u201cOut-of-bounds\nWrite\u201d, Classic\nBuffer Overflow, and \u201cIncorrect Calculation of Buffer Size\u201d by remote access. Successful exploitation of this vulnerability\ncan lead to arbitrary\ncode execution. It could also impact\nConfidentiality,\nIntegrity,\nand Availability."}], "id": "CVE-2026-97631", "lastModified": "2026-10-22T17:40:46.877", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.5, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "infosec@edk2.groups.io", "type": "Secondary"}]}, "published": "2026-10-22T17:17:02.027", "references": [{"source": "infosec@edk2.groups.io", "url": "https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m"}], "sourceIdentifier": "infosec@edk2.groups.io", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}, {"lang": "en", "value": "CWE-131"}, {"lang": "en", "value": "CWE-787"}], "source": "infosec@edk2.groups.io", "type": "Secondary"}]}

{}