{"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":"2026-10-28T16:06:34.929Z"},"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 “Out-of-bounds\nWrite”, Classic\nBuffer Overflow, and “Incorrect Calculation of Buffer Size” 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 “Out-of-bounds\nWrite”, Classic\nBuffer Overflow, and “Incorrect Calculation of Buffer Size” 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"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-10-28T16:06:34.929Z"},"references":[{"url":"https://arstechnica.com/security/2026/10/code-execution-flaw-in-uefi-firmware-threatens-most-servers-on-planet-earth/"},{"url":"https://news.ycombinator.com/item?id=50265393"},{"url":"https://github.com/microsoft/mu_basecore/pull/1990"},{"url":"https://github.com/microsoft/mu_basecore/pull/1989"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/28/4"}],"title":"CVE Program Container","x_generator":{"engine":"ADPogram 0.0.1"}}]}}