CVE-2026-58641

Analyzed Analyzed - Analysis Complete

Integer Overflow in .NET Framework Elevates Privileges

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-14

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-58641

EUVD

EUVD-2026-56606

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	.net	From 8.0.0 (inc) to 8.0.30 (exc)
microsoft	.net	From 9.0.0 (inc) to 9.0.19 (exc)
microsoft	.net	From 10.0.0 (inc) to 10.0.11 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow or wraparound flaw in .NET that allows an unauthorized attacker to elevate their privileges locally. This means an attacker could gain higher access rights than intended, potentially taking control of system functions.

Detection Guidance

This vulnerability involves an integer overflow in .NET that could allow local privilege escalation. Detection requires checking for vulnerable .NET versions and monitoring for unusual privilege changes. Review installed .NET versions and apply Microsoft's security updates.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain elevated privileges on your system. This might let them install malicious software, view or delete data, or create new accounts with full user rights, depending on the system configuration.

Compliance Impact

This vulnerability allows local privilege escalation in .NET applications, which could enable unauthorized access to sensitive data or system functions. For GDPR, this may increase risks of unauthorized data access or processing, potentially violating confidentiality requirements. For HIPAA, local privilege escalation could lead to unauthorized access to protected health information, compromising security controls.

Mitigation Strategies

Apply the latest security updates from Microsoft for .NET to patch the integer overflow vulnerability. Monitor Microsoft's update guide for patches and install them promptly.

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