{"id":"CVE-2026-97631","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-97631","generatedAt":"2026-11-02T04:03:17.117Z","title":"EDK2 contains a vulnerability in BIOS where a user may cause “Out-of-bounds Write”, Classic Buffer Overflow, and “Incorrect Calculation of Buffer Size” by remote access.","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.","published":"2026-10-22T17:17:02.000Z","lastModified":"2026-10-30T20:17:40.000Z","status":"Deferred","sourceIdentifier":"infosec@edk2.groups.io","cvss":{"version":"4.0","score":9.5,"severity":"CRITICAL","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/M"},"cwe":["CWE-120","CWE-131","CWE-787"],"affected":[],"epss":{"score":0.00635,"percentile":0.50454,"date":"2026-11-01","history":[{"date":"2026-10-23","score":0.00432,"percentile":0.36541}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T17:17:02.000Z","detail":{"score":"9.5","severity":"CRITICAL","publishedAt":"2026-10-22T17:17:02.027Z"},"summary":"New CVE, critical severity (CVSS 9.5)."}],"references":[{"url":"https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m","source":"infosec@edk2.groups.io"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/28/4","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://arstechnica.com/security/2026/10/code-execution-flaw-in-uefi-firmware-threatens-most-servers-on-planet-earth/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/microsoft/mu_basecore/pull/1989","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/microsoft/mu_basecore/pull/1990","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://news.ycombinator.com/item?id=50265393","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97631","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}