Microsoft Office Word: Remote code execution via heap buffer overflow
Summary
A heap-based buffer overflow in Microsoft Office Word allows an unauthenticated remote attacker to execute code on the affected system. Exploitation requires that a user opens a malicious document, typically received by email or download. Microsoft has released fixes. The CVE record rates exploit maturity as unproven.
Affected
- Microsoft 365 Apps for Enterprise (32-bit and x64), from 16.0.1 before the fixed build
- Office 365 for Mac, from 1.0.0 before 16.115.26110837
- Office LTSC 2021 (32-bit and x64), from 16.0.1 before 16.0.14334.21048
- Office LTSC 2024, from 16.0.0 before 16.0.17932.21140 (verify against MSRC)
- Office LTSC for Mac 2021, from 16.0.1 before 16.115.26110837
- Office LTSC for Mac 2024, from 16.0.0 before 16.115.26110837
Fixed in
- Office LTSC 2021: 16.0.14334.21048
- Office 365 for Mac and Office LTSC for Mac: 16.115.26110837
- Office LTSC 2024: 16.0.17932.21140 (from a secondary source, verify against MSRC)
- Microsoft 365 Apps for Enterprise: Unknown. See https://aka.ms/OfficeSecurityReleases
Workaround
Unknown.
- No vendor workaround is known for this CVE. Install the November 2026 security updates.
Exploitation
- No exploitation in the wild is known for this CVE.
- CVE record exploit maturity: Unproven.
- No public proof of concept is known.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Install the November 2026 security updates on all affected Office builds, starting with workstations that handle email and shared documents.
- Verify the installed builds against the MSRC advisory, especially Microsoft 365 Apps and Office LTSC 2024.
- Until patched, keep Protected View enabled and restrict documents from untrusted senders where feasible.
- Monitor NVD and MSRC for changes in exploitation status or fixed builds.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-110061 msrc.microsoft.com
- CVE Record CVE-2026-110061 www.cve.org
- Strix CVE-2026-110061 www.strix.ai
- Qualys Patch Tuesday November 2026 review blog.qualys.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 10 Nov 2026, 23:46.
Original description (NVD)
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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