CVE-2026-97631

CVSS 9.5 (critical) · published 2026-10-22

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.

Weakness: CWE-120, CWE-131, CWE-787

Source: NVD CVE-2026-97631

References

• https://github.com/tianocore/edk2/security/advisories/GHSA-99cj-7hg9-mp4m
• http://www.openwall.com/lists/oss-security/2026/10/28/4
• 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
• https://github.com/microsoft/mu_basecore/pull/1990
• https://news.ycombinator.com/item?id=50265393

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