EUVD-2026-44192
GHSA-jgr3-cvvq-qqh3
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-parsing flaw requiring the user to open a malicious document (AV:L, UI:R), no prior privileges (PR:N), yielding full code execution as the user (C/I/A:H).
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
2DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and Office for Mac) arises from a heap-based buffer overflow (CWE-122) triggered when a user opens a maliciously crafted document. Rated CVSS 7.8 (AV:L/UI:R), an attacker who convinces a victim to open a weaponized file can run arbitrary code in the context of the current user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open an attacker-supplied malicious Office document - the CVSS vector's UI:R confirms user interaction is mandatory, which is the primary limiting factor. … 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, 7.8 High) describes a low-complexity, no-privilege attack that nonetheless requires user interaction and is scored local vector because exploitation happens through file handling on the target machine rather than over the network. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a target a specially crafted Office document (or hosts it for download) and uses social engineering to get the victim to open it. When opened, the malformed file triggers the heap overflow in Office's parser, executing attacker code with the victim's privileges - enabling malware installation or credential theft. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-55129 via the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55129, ensuring Windows Office channels (Microsoft 365 Apps, Office 2016/2019, LTSC 2021/2024) and macOS builds each receive their respective fixed builds through Microsoft Update, Click-to-Run, or AutoUpdate for Mac. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Microsoft Office 2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, or Office for Mac and assess patch readiness. …
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Local code execution in Microsoft Word (and Office/SharePoint components that render Word content) stems from an integer
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and the macOS editions) arises
Arbitrary code execution in Microsoft Office Word (and the broader Office/365/SharePoint family) arises from a stack-bas
Local code execution in Microsoft Office (including Microsoft 365 Apps for Enterprise, Office 2016/2019, and Office LTSC
Local code execution in Microsoft Word (part of Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, and Office for M
Local arbitrary code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and O
Arbitrary code execution in Microsoft PowerPoint (and the broader Microsoft Office/365 suite on Windows and macOS) arise
Local code execution in Microsoft Office PowerPoint (including Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, a
Local code execution in Microsoft Office PowerPoint (CWE-122 heap-based buffer overflow) lets an unauthorized attacker r
Local code execution in Microsoft Word (and the wider Microsoft Office / Microsoft 365 Apps family) lets an unauthorized
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and Office for
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024)
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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