Vulnerability record/PUBLISHED/Published Oct 22, 2026 16:32:27 UTC

CVE-2026-97631

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. Successful exploitation of this vulnerability can lead to arbitrary code execution. It could also impact Confidentiality, Integrity, and Availability.

Base score9.5/ 10

SeverityCriticalCVSS 4.0

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityCritical

Attack vectorNetworkAV

Attack complexityLowAC

Attack requirementsPresentAT

Privileges requiredNonePR

User interactionNoneUI

Vulnerable system confidentialityHighVC

Vulnerable system integrityHighVI

Vulnerable system availabilityHighVA

Subsequent system confidentialityHighSC

Subsequent system integrityHighSI

Subsequent system availabilityHighSA

CVSS vector stringCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering AuthorityTianoCore

Last updatedOct 30, 2026 19:34:40 UTC

PublishedOct 22, 2026 16:32:27 UTC

ReservedSep 24, 2026 16:56:45 UTC

Credits

Alex Matrosov (Anthropic)
Dan Holmes-Mitra (Google)