Code-execution flaw in UEFI firmware affects most servers on planet Earth

Image credit: Muhammad.Abdullah via Magnific. Article by Dan Goodin. Ars Technica – October 27, 2026. 

Defenders across the world face the burden of responding to yet another botched code-execution vulnerability, this time in boot-time firmware used by most of the world’s server vendors and data centers. The vulnerability, with a severity rating of 9.5 out of 10, resides in the TianoCore EDK II, an open source codebase that hardware makers and cloud providers use to create the UEFI firmware that runs during the boot-up sequence. Last year, a representative of the UEFI Forum called EDK2 the “preeminent solution / implementation of the UEFI specifications.” […]

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Curated by John Wysocki

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