# CVE-2026-97631: Pre-boot RCE in EDK II PXE driver

> CVE-2026-97631: Pre-boot RCE in EDK II PXE driver. CVSS 9.5 (CVSS 4.0), named in 1 status incident(s).

Canonical: https://rewindex.com/cve/CVE-2026-97631
Last updated: 2026-10-30T20:17:39Z

- Published: 2026-10-22 16:32 UTC · Updated: 2026-10-30 20:17 UTC · Assigner: TianoCore
- CVSS: 9.5 (CVSS 4.0) · Severity: Critical
- EPSS: n/a
- CISA KEV: no
- CWE: CWE-120, CWE-131, CWE-787

## Description

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.

## Affected vendors and products

- TianoCore: EDK2

## Status incidents that name it

- 2026-10-28 17:08 UTC [Hetzner: CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component](https://rewindex.com/company/hetzner/incidents/54493dac-b3a2-44f0-8d8b-6de8b25d8f17.md) (names this CVE): “CVE-2026-97631 - critical security vulnerability in the EDK II UEFI firmware component Network filters have already been in place…”

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-97631)
- [NVD entry](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)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-97631 · Markdown: https://rewindex.com/cve/CVE-2026-97631.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-97631 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:38:53.422Z