Vulnerability DatabaseCVE-2026-97631
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CVE-2026-97631
Published:October 22, 2026
Updated:November 02, 2026
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.
Related Resources (6)
http://www.openwall.com/lists/oss-security/2026/10/28/4
https://github.com/microsoft/mu_basecore/pull/1990
https://news.ycombinator.com/item?id=50265393
https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m
https://arstechnica.com/security/2026/10/code-execution-flaw-in-uefi-firmware-threatens-most-servers-on-planet-earth/
https://github.com/microsoft/mu_basecore/pull/1989
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CVSS v4
Base Score:
9.5
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Out-of-bounds Write
CWE-787
Incorrect Calculation of Buffer Size
CWE-131
Buffer Copy without Checking Size of Input
CWE-120
EPSS
Base Score:
0.64