EUVD-2026-56607
GHSA-fp58-2vh9-25hg
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-triggered heap overflow requires no privileges but mandates user interaction; full C/I/A reflects arbitrary code execution at user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Word enables local code execution with full user-level impact when a victim opens a specially crafted document. Affected products span Microsoft 365 Apps for Enterprise, Office LTSC 2021 and 2024 (both Windows and Mac), and Office 365 for Mac. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required: the victim must actively open a specially crafted Word document in an affected version of Microsoft Office Word. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) scores 7.8, indicating local attack vector with low complexity, no required privileges, but mandatory user interaction - consistent with a malicious document scenario rather than a network-reachable service. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document (.docx or .doc) embedding a heap overflow payload in a specially structured document element, then delivers it to a target via spearphishing email or a drive-by download link. When the victim opens the file in a vulnerable version of Microsoft Word, the document parser writes beyond a heap buffer boundary, corrupting memory in a way that redirects execution to attacker-controlled shellcode, granting the attacker code execution in the context of the logged-in user. … |
| Remediation | Apply the vendor-released patch immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, issue urgent advisory to all staff on affected Office versions (Microsoft 365 Apps for Enterprise, Office LTSC 2021 and 2024 for Windows and Mac, Office 365 for Mac) warning against opening unsolicited documents; simultaneously prepare patch deployment for testing. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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