EUVD-2026-73260
GHSA-4jr5-pfm8-9568
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered font data, no privileges needed, user must open content (UI:R), full system compromise on success; unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Heap-based buffer overflow in Graphic Fonts allows an unauthorized attacker to execute code over a network.
Articles & Coverage 1
AnalysisAI
Heap-based buffer overflow in Windows' Graphic Fonts component (CWE-122) enables unauthenticated remote attackers to achieve arbitrary code execution on a wide range of Windows client and server editions by inducing a user to open or preview maliciously crafted font data. Affecting 19 distinct Windows product lines from Server 2012 through Windows 11 26H1, the vulnerability carries a CVSS 3.1 score of 8.8 with full C:H/I:H/A:H impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a user on an unpatched Windows system open, preview, or render content containing a specially crafted font - delivered via a malicious Office document, PDF, email attachment, or web page. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H reflects a high-priority patch candidate: network-reachable, no privileges required, low complexity, and full triad impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update for CVE-2026-72986 immediately via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows systems (clients and servers from Windows Server 2012 through Windows 11 26H1) and assess exposure based on user roles and font-handling practices. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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