Microsoft Office Word: Heap-based buffer overflow allows remote code execution
Summary
A heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network. The attack requires a user to take an action, most likely opening a crafted Word file received by email or download. The CVSS base score is 8.8 (HIGH), and Microsoft's temporal metrics indicate that exploit code maturity is unproven.
Affected
- Microsoft 365 Apps for Enterprise (32-bit and x64): from 16.0.1, fixed build to be confirmed on the MSRC page
- Office LTSC 2021: from 16.0.1 before 16.0.14334.21048
- Office 365 for Mac: from 1.0.0 before 16.115.26110837
- Office LTSC 2024: from 16.0.0, fixed build unverified (third-party source: 16.0.17932.21140)
- Office LTSC for Mac 2021 and 2024: from 16.0.0 or 16.0.1, fixed build unverified (third-party source: 16.115.26110837)
Fixed in
- Office LTSC 2021: 16.0.14334.21048 and later
- Office 365 for Mac: 16.115.26110837 and later
- Microsoft 365 Apps for Enterprise: see the Microsoft release page (https://aka.ms/OfficeSecurityReleases); build number unknown
- Office LTSC 2024 and LTSC for Mac: unverified, confirm on MSRC
Workaround
- Unknown. No vendor-published workaround specific to this CVE was found. Installing the update is the recommended fix.
- Interim measures (own advice): keep Protected View enabled for files from the internet and email; block or quarantine Office attachments from untrusted senders; apply Attack Surface Reduction rules that block Office apps from creating child processes.
Exploitation
- No evidence of exploitation in the wild found at publication.
- No CISA KEV entry or public proof of concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- This reflects the state at publication and is not a confirmed absence.
Our recommendation
- Inventory all Office installations and their channels (Microsoft 365 Apps, LTSC 2021/2024, Mac).
- Confirm patched build numbers on the MSRC advisory page and apply the update within the normal patch cycle.
- Until patched, restrict opening Word files from untrusted senders and keep Protected View enabled.
- Monitor for a CISA KEV addition or public exploit code and raise the priority if either appears.
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-2026-112719 msrc.microsoft.com
- CVE.org CVE Record CVE-2026-112719 www.cve.org
- Strix AI: CVE-2026-112719 (third-party, unverified) www.strix.ai
- Qualys: Microsoft 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, 22:58.
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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