---
title: "CVE-2026-97631: EDK2 BIOS - Buffer Overflow"
description: "EDK2 BIOS contains a buffer overflow caused by out-of-bounds write and incorrect buffer size calculation, letting remote attackers execute arbitrary code, exploit requires remote access."
url: https://panop.io/threat-heartbeat/CVE-2026-97631/
---

# CVE-2026-97631 EDK2 BIOS - Buffer Overflow

EDK2 BIOS contains a buffer overflow caused by out-of-bounds write and incorrect buffer size calculation, letting remote attackers execute arbitrary code, exploit requires remote access.

CVSS base score 9.5 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-97631)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Information Disclosure, Data Tampering, Denial Of Service

CVSS 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

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-120](https://cwe.mitre.org/data/definitions/120.html)

## Vendor fix

Update to the latest version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-97631](https://nvd.nist.gov/vuln/detail/CVE-2026-97631)
- [https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m](https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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