EUVD-2026-73632
GHSA-9vp8-m8j4-xqr2
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Text shaping triggered by network-delivered content justifies AV:N/PR:N/UI:N; reliable heap exploitation requires specific layout conditions (AC:H); successful exploitation yields full code execution (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Text Shaping allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow (CWE-122) in the Windows Text Shaping subsystem allows remote unauthenticated attackers to achieve arbitrary code execution, with full confidentiality, integrity, and availability impact across an exceptionally broad range of Windows versions spanning Server 2012 through Windows 11 26H1. The CVSS 3.1 score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) signals network-reachable, authentication-free exploitation tempered by high attack complexity - indicating that triggering reliable code execution requires overcoming specific environmental conditions such as precise heap layout. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required (PR:N) and no user interaction is required (UI:N) per the provided CVSS vector - Windows Text Shaping can be triggered by the OS during content rendering without explicit user action such as opening a file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 vector (AV:N/AC:H/PR:N/UI:N) reflects a genuine tension: the attack surface is enormous - virtually every Windows installation is affected - but AC:H signals that reliable exploitation demands precise exploitation primitives, most likely a controlled heap layout or a race condition, making mass automated exploitation significantly harder than AC:L flaws. … 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 Windows cumulative update for the affected build via Windows Update, Windows Server Update Services (WSUS), or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems in your environment (including Windows Server 2012 R2, 2016, 2019, 2022, and Windows 11 versions) and verify patch availability from Microsoft. …
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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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