{"id":"CVE-2026-97631","title":"Pre-boot RCE in EDK II PXE driver","summary":"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…","severity":"critical","cvss":9.5,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-120","CWE-131","CWE-787"],"vendor":"TianoCore","product":"NetworkPkg","affected":["NetworkPkg <= edk2-stable202608"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T16:37:13.437Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97631","references":[{"url":"https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T22:00:50.345Z","slug":"CVE-2026-97631","body":"## Overview\n\nEDK2 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.\n\n## Affected\n\n- `NetworkPkg <= edk2-stable202608`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}