CVE-2026-55044

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Microsoft Office Excel

Publication date: 2026-07-14

Last updated on: 2026-07-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-16

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55044

EUVD

EUVD-2026-44195

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	excel	2016
microsoft	excel	2016
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_online_server	to 16.0.10417.20175 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in Microsoft Office Excel. It allows an unauthorized attacker to execute code locally by exploiting a memory access issue in Excel.

Detection Guidance

This vulnerability involves an out-of-bounds read in Microsoft Office Excel. Detection typically requires monitoring for suspicious Excel file activity or analyzing system logs for unauthorized code execution attempts. Use Microsoft's official security updates and tools like Windows Defender to scan for known indicators of compromise.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your computer if you open a specially crafted Excel file.

Compliance Impact

This vulnerability allows unauthorized code execution locally, which could lead to unauthorized data access or modification. This may impact compliance with GDPR (data protection) and HIPAA (health data security) by increasing the risk of data breaches or unauthorized processing.

Mitigation Strategies

Apply the latest security updates from Microsoft for Excel as soon as possible to patch the out-of-bounds read vulnerability.

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