What is CVE-2026-55999?

CVE-2026-55999 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. xorg-server / xwayland glamor font atlas Heap Buffer Overflow

Which CVE IDs does CVE-2026-55999 cover?

CVE-2026-55999 covers the following CVE IDs: CVE-2026-55999. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55999?

CVE-2026-55999 has a CVSS v3 base score of 8.5, published by Microsoft Security Response Center (MSRC).

CVE-2026-55999HighCVSS 8.5

xorg-server / xwayland glamor font atlas Heap Buffer Overflow

Vendor

Microsoft Security Response Center (MSRC)

Published

July 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-55999 →