CVE-2026-62886
published 2026-08-11CVE-2026-62886: Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
PriorityP344high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
0.47%
39.4th percentile
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| devspaces | udi-rhel9 | — | — |
| microsoft | microsoft_net_framework_3.5 | >= 3.5.0 < 2.0.50727.8987 AND 3.0.30729.8982 | 2.0.50727.8987 AND 3.0.30729.8982 |
| microsoft | microsoft_net_framework_3.5_and_4.6.2_4.7_4.7.1_4.7.2 | >= 3.0.0.0 < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 |
| microsoft | microsoft_net_framework_3.5_and_4.7.2 | >= 4.7.0 < 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0 | 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0 |
| microsoft | microsoft_net_framework_3.5_and_4.8 | >= 4.8.0 < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 |
| microsoft | microsoft_net_framework_3.5_and_4.8.1 | >= 4.8.1 < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 |
| microsoft | microsoft_net_framework_4.6.2_4.7_4.7.1_4.7.2 | >= 4.7.0 < 4.7.4145.0 | 4.7.4145.0 |
| microsoft | microsoft_net_framework_4.8 | >= 4.8.0 < 4.8.4806.0 | 4.8.4806.0 |
| microsoft | microsoft_net_framework_4.8.1 | >= 4.8.0.0 < 4.8.9347.0 | 4.8.9347.0 |
| microsoft | microsoft_visual_studio_2026_version_18.8 | >= 18.0 < 18.8.3 | 18.8.3 |
| microsoft | net | >= 10.0.0 < 10.0.11 | 10.0.11 |
| microsoft | net | >= 8.0.0 < 8.0.30 | 8.0.30 |
| microsoft | net | >= 9.0.0 < 9.0.19 | 9.0.19 |
| microsoft | visual_studio_2022 | >= 17.14.0 < 17.14.38 | 17.14.38 |
| microsoft | visual_studio_2026 | >= 18.8.0 < 18.8.3 | 18.8.3 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ghsa7.8HIGH
vendor_redhat7.8HIGH
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VulDB
Microsoft .NET/Visual Studio up to 18.8 integer overflow (WID-SEC-2026-2761)
vuldb·2026-08-15·CVSS 7.8
CVE-2026-62886 [HIGH] Microsoft .NET/Visual Studio up to 18.8 integer overflow (WID-SEC-2026-2761)
A vulnerability was found in Microsoft .NET and Visual Studio 10.0/8.0/9.0/17.14/18.8 and classified as problematic. This affects an unknown function. Such manipulation leads to integer overflow.
This vulnerability is documented as CVE-2026-62886. The attack needs to be performed locally. There is not any exploit available.
Applying a patch is advised to resolve this issue.
GHSA
Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerability
ghsa·2026-08-11·CVSS 7.8
CVE-2026-62886 [HIGH] CWE-122 Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerability
Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in Windows Presentation Foundation. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/430
## CVSS Details
- **Version:** 3.1
- **Severity:** High
- **Score:** 7.8
- **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`
- **Weakness:** CWE-190: Integer Overflow or Wraparound; CWE-122: Heap-b
Red Hat
dotnet: .NET: Privilege Elevation via Integer Overflow
vendor_redhat·2026-08-11·CVSS 7.8
CVE-2026-62886 [HIGH] CWE-190 dotnet: .NET: Privilege Elevation via Integer Overflow
dotnet: .NET: Privilege Elevation via Integer Overflow
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
A flaw was found in .NET. This vulnerability, caused by an integer overflow or wraparound, allows an unauthorized local attacker to elevate their privileges on the system. This could grant the attacker higher access than intended, potentially leading to further system compromise.
Statement: This vulnerability is an integer overflow in the .NET runtime that allows a local attacker to elevate privileges. Red Hat's currently shipped .NET 8.0, 9.0, and 10.0 packages across RHEL 8/9/10, RHEL for Edge/Automotive (rhivos), and Hummingbird already include the upstream fix (runtime 8.0.30, 9.0.19, and 10.0.11 respectively) and are therefore
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - August 2026
blogs_rapid7·2026-08-11·CVSS 7.2
CVE-2026-68821 [HIGH] Patch Tuesday - August 2026
Microsoft is publishing 421 vulnerabilities on August 2026 Patch Tuesday , including 236 vulnerabilities in Windows. This is lower volume than last month’s record-breaking behemoth, but still one of the largest Patch Tuesday totals ever. There is no reason to suppose that Patch Tuesday will ever return to the lower volumes we saw prior to 2026. Microsoft is aware of exploitation in the wild for one of the vulnerabilities published today, as well as public disclosure for two others, although the Notable CVEs section of the Security Update Guide omits one of these. As usual, browser vulns are not included in the Patch Tuesday count above, but unusually, Microsoft does not appear to have published any desktop browser security patches so far this month.
## Summary charts
## Summary tables
#
Sans Isc
Microsoft Patch Tuesday August 2026, (Tue, Aug 11th)
blogs_sans_isc·2026-08-11·CVSS 7.8
CVE-2026-68820 [HIGH] Microsoft Patch Tuesday August 2026, (Tue, Aug 11th)
Microsoft Patch Tuesday August 2026
Published: 2026-08-11. Last Updated: 2026-08-11 17:54:49 UTC
by Renato Marinho (Version: 1)
0 comment(s)
This month we got patches for 418 vulnerabilities. Of these, 62 are critical, 1 is being exploited in the wild, and 2 were publicly disclosed as zero-days. Notable fixes include Windows privilege escalation, container tampering, and critical QUIC and DNS Server remote code execution bugs.
A few vulnerabilities worth mentioning:
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability (CVE-2026-68820)
This Important-severity elevation of privilege vulnerability is listed by Microsoft as exploited in the wild but not publicly disclosed, and it has a CVSS score of 7.0. The flaw is a use-after-free issue in the Windows Ancil
Bugzilla
CVE-2026-62886 dotnet: .NET: Privilege Elevation via Integer Overflow
bugzilla·2026-08-11·CVSS 7.8
CVE-2026-62886 [HIGH] CVE-2026-62886 dotnet: .NET: Privilege Elevation via Integer Overflow
CVE-2026-62886 dotnet: .NET: Privilege Elevation via Integer Overflow
Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
2026-08-11
Published