CVE-2026-58641: .NET Elevation of Privilege Vulnerability
CVE-2026-58641 is an elevation of privilege vulnerability in .NET, rated Important by Microsoft, with a CVSS 3.1 base score of 7.8 (High). An attacker can exploit it by an attacker with local access, without any privileges and only if a user takes an action. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. The EPSS model estimates a 0.47% probability of exploitation activity in the next 30 days, higher than 41% of all scored vulnerabilities. Microsoft released the fix on 11 August 2026 in the August 2026 Patch Tuesday. It affects 1 product in 1 product family (Developer Tools).
Key facts
- CVE ID
- CVE-2026-58641
- Severity
- High CVSS 7.8
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-190
- EPSS
- 0.47% (percentile 41%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- August 2026 Patch Tuesday
- Product families
- Developer Tools
CVSS score and vector
Microsoft scores CVE-2026-58641 at 7.8 (temporal 6.8) using CVSS 3.1. 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
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Frequently asked questions (Microsoft)
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Affected products (1)
Developer Tools
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| SkiaSharp 4.151.2 | Release Notes | Security Update | 4.151.2 | No |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 7.8 (HIGH)
- NVD weakness
- CWE-190
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| .net | from 8.0.0, before 8.0.30 |
| .net | from 9.0.0, before 9.0.19 |
| .net | from 8.0.0, before 8.0.30 |
| .net | from 9.0.0, before 9.0.19 |
| .net | from 10.0.0, before 10.0.11 |
| .net | from 8.0.0, before 8.0.30 |
| .net | from 9.0.0, before 9.0.19 |
| .net | from 10.0.0, before 10.0.11 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58641 (Vendor Advisory)
Acknowledgments
- Matthew Leibowitz
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 1.1 | Added SkiaSharp 4.151.2 to the affected software table. |