{"id":"CVE-2026-97631","aliases":[],"title":"Pre-boot RCE in EDK II PXE driver","titleSource":"TianoCore","descriptionSource":"TianoCore","products":[{"vendor":"TianoCore","name":"EDK2","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"edk2-stable202608","versionType":"custom"}],"defaultStatus":"unaffected","source":"TianoCore","url":"https://www.cve.org/CVERecord?id=CVE-2026-97631"}],"remediation":[],"description":"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.","severity":"critical","score":9.5,"published":"2026-10-22T16:32:27.619Z","modified":"2026-10-28T16:06:34.929Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m"],"sources":[{"name":"CVE","id":"CVE-2026-97631","modified":"2026-10-28T16:06:34.929Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-97631"}],"assessments":[{"source":"TianoCore","vector":"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","score":9.5}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T02:15:32.063Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T15:15:33.180Z","attemptedAt":"2026-10-28T15:15:33.180Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T15:15:33.180Z","attemptedAt":"2026-10-28T15:15:33.180Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T15:15:33.180Z","attemptedAt":"2026-10-28T15:15:33.180Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-28T15:15:33.180Z","attemptedAt":"2026-10-28T15:15:33.180Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-97631","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97631","modified":"2026-10-22T17:40:46.877","score":9.5,"vector":"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","checkedAt":"2026-10-28T15:15:33.180Z"},{"source":"ENISA EUVD","id":"EUVD-2026-108230","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-108230","modified":"Oct 28, 2026, 2:37:00 PM","score":9.5,"vector":"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","checkedAt":"2026-10-28T15:15:33.180Z"},{"source":"FIRST EPSS","id":"CVE-2026-97631","url":"https://www.first.org/epss/","probability":0.00483,"percentile":0.41529,"date":"2026-10-28","checkedAt":"2026-10-28T15:15:33.180Z"}]}