CVE-2026-42831 Details
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
A heap-based buffer overflow vulnerability has been identified in Microsoft Office. This vulnerability allows an unauthorized attacker to execute code locally. It affects multiple versions of Microsoft Office, including the Office LTSC for Mac 2024, Office for Android, and Office LTSC for Mac 2021.
Users can download the security update for Microsoft Office LTSC for Mac 2024 and 2021 from the Microsoft Update Catalog. For Microsoft Office for Android, the security update is available on the Google Play Store.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 copilot | < 16.0.19822.20190 |
CPE
Remediation
| |
| microsoft office | 2024 |
CPE
Remediation
| |
| microsoft office long term servicing channel | 2021 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 22, 2026 | CPE Deprecation Remap | [email protected] |
| May 19, 2026 | CPE Deprecation Remap | [email protected] |
| May 16, 2026 | Initial Analysis | [email protected] |
| May 12, 2026 | New CVE Received | [email protected] |