EUVD-2026-35666
GHSA-xhmf-jjc9-v9vr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office is possible through a heap-based buffer overflow (CWE-122) that triggers when a user opens or previews a maliciously crafted document. The CVSS 7.8 score reflects local attack vector with required user interaction, and no public exploit identified at time of analysis. Successful exploitation yields full confidentiality, integrity, and availability impact in the context of the current user.
Technical ContextAI
The flaw is a heap-based buffer overflow (CWE-122) inside Microsoft Office's document parsing or rendering code paths. Heap overflows occur when code writes past the bounds of a dynamically allocated buffer, corrupting adjacent heap metadata or object pointers; in modern Office this is typically reached through malformed structures inside OOXML, RTF, or legacy binary formats (e.g., crafted records, embedded objects, or font/image streams) processed by Office's parsers. Exact affected SKUs and builds are not enumerated in the provided NVD data - no CPE strings were supplied - and resolution depends on the Microsoft Security Update Guide entry referenced for the CVE.
RemediationAI
Apply the Microsoft security update referenced in the MSRC advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44824) on Patch Tuesday cadence; exact fixed build numbers are not included in the NVD data and must be read from the MSRC guide per Office channel (Current Channel, Monthly Enterprise, Semi-Annual, LTSC, Office for Mac). No vendor-released patch version was provided in this dataset, so verify the update KB matches your deployed Click-to-Run or MSI channel. Until patched, compensating controls include enabling Protected View and Application Guard for Office, blocking inbound Office documents from untrusted senders at the mail gateway, disabling the Outlook Reading/Preview Pane for high-risk mailboxes (trade-off: reduces triage speed), and applying Attack Surface Reduction rules such as 'Block Office applications from creating child processes' and 'Block executable content from email client and webmail' (trade-off: may break legitimate macro-driven workflows).
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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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