CVE-2026-58641 — .NET Elevation of Privilege Vulnerability

Executive Summary

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

Overview

7.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Aug 11 2026

Last Updated Aug 11 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00401 — 0.33228 percentile

NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.8

EPSS Score

0.00401

probability of exploitation in the next 30 days

0.33228 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
.NET 10.0 installed on Linux	`5122106 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 10.0 installed on Mac OS	`5122106 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Linux	`5122104 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Mac OS	`5122104 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Windows	`5122104 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Linux	`5122105 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Mac OS	`5122105 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Windows	`5122105 (Security Update)`	Important	Elevation of Privilege	Maybe

Patches

3 patches

Article	Type	Restart
`5122106`	Security Update	Maybe
`5122104`	Security Update	Maybe
`5122105`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Matthew Leibowitz

References

MSRC Advisory MITRE NVD