CVE-2026-55035 Details
Description
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
A vulnerability allowing out-of-bounds read has been identified in Microsoft Office. This issue enables an unauthorized attacker to locally disclose information by reading small portions of heap memory. The vulnerability affects several Microsoft Office products and versions, including Microsoft Office 2016 (32-bit and 64-bit editions), Microsoft Office 2019 (32-bit and 64-bit editions), Microsoft Office LTSC 2021 (32-bit and 64-bit editions), Microsoft Office LTSC for Mac 2021, Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft 365 Apps for Enterprise (32-bit and 64-bit systems), and various SharePoint Server editions.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. Specific update links are available in the Microsoft Knowledge Base articles referenced in the product update details.
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 Jul 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55035 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft microsoft 365 | All versions |
CPE
Remediation
| |
| microsoft office 2016 | All versions |
CPE
Remediation
| |
| microsoft office 2019 | All versions |
CPE
Remediation
| |
| microsoft office 2021 | All versions |
CPE
Remediation
| |
| microsoft office 2024 | All versions |
CPE
Remediation
| |
| microsoft sharepoint server | < 16.0.19725.20434 2016 2019 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 16, 2026 | Initial Analysis | [email protected] |
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |