CVE-2026-69439
published 2026-09-08CVE-2026-69439: Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
PriorityP357high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.82%
57.0th percentile
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_visual_studio_2022_version_17.14 | >= 17.14.0 < 17.14.40 | 17.14.40 |
| microsoft | microsoft_visual_studio_2026_version_18.9 | >= 18.9.0 < 18.9.3 | 18.9.3 |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | — | — |
| microsoft | net | >= 10.0.0 < 10.0.12 | 10.0.12 |
| microsoft | net | >= 8.0.0 < 8.0.31 | 8.0.31 |
| microsoft | net | >= 9.0.0 < 9.0.20 | 9.0.20 |
| microsoft | net_10.0 | >= 10.0.0 < 10.0.12 | 10.0.12 |
| microsoft | net_11.0 | >= 11.0.0 < 11.0 RC1 | 11.0 RC1 |
| microsoft | net_8.0 | >= 8.0.0 < 8.0.31 | 8.0.31 |
| microsoft | net_9.0 | >= 9.0.0 < 9.0.20 | 9.0.20 |
| microsoft | visual_studio_2022 | >= 17.14.0 < 17.14.40 | 17.14.40 |
| microsoft | visual_studio_2026 | >= 18.9.0 < 18.9.3 | 18.9.3 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
ghsa8.8HIGH
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GHSA
Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
ghsa·2026-09-09·CVSS 8.8
CVE-2026-69439 [HIGH] CWE-122 Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
# Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.DiaSymReader.Native. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An out of bounds write can occur when parsing a Portable PDB file.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/438
## CVSS Details
- **Version:** 3.1
- **Severity:** High
- **Score:** 8.8
- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`
GHSA
Duplicate Advisory: Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
ghsa·2026-09-08·CVSS 8.8
CVE-2026-69439 [HIGH] CWE-122 Duplicate Advisory: Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
Duplicate Advisory: Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-527h-q9f6-p7qx. This link is maintained to preserve external references.
### Original Description
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
No detection rules found.
No public exploits indexed.
Sans Isc
September 2026 Microsoft Patch Tuesday, (Tue, Sep 8th)
blogs_sans_isc·2026-09-08·CVSS 7.8
CVE-2026-81963 [HIGH] September 2026 Microsoft Patch Tuesday, (Tue, Sep 8th)
September 2026 Microsoft Patch Tuesday
Published: 2026-09-08. Last Updated: 2026-09-08 19:20:30 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
This month, Microsoft released patches for a record-breaking 973 vulnerabilities, including 113 rated critical. It is by far the largest Patch Tuesday to date, well ahead of the previous high of 664 set in July 2026. Two vulnerabilities are listed as exploited in the wild, while none were publicly disclosed before Patch Tuesday. Notable fixes include Windows privilege escalation and critical RCEs in Skype for Business, MSMQ and RRAS.
A few vulnerabilities worth mentioning:
Windows Update Stack Elevation of Privilege Vulnerability (CVE-2026-81963)
Microsoft reports that CVE-2026-81963 is being exploited, though it was not publicly disclosed b
Rapid7
Patch Tuesday - September 2026
blogs_rapid7·2026-09-08·CVSS 7.8
CVE-2026-85880 [HIGH] Patch Tuesday - September 2026
Microsoft is publishing 974 own-product vulnerabilities on September 2026 Patch Tuesday , including 723 vulnerabilities in Windows. Along with Microsoft fixes for 25 non-Microsoft CVEs, that brings the total number of vulnerabilities on the table today to 999. Whether this is the biggest Patch Tuesday ever depends on how we count, but this is by far the most CVEs that Microsoft has ever published in a single day. As Rapid7 noted last month, 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 two of the vulnerabilities published today.
## Windows ALPC: zero-day EoP
The eternal game of elevation of privilege whack-a-mole between Microsoft and attackers continues. This month, the batt
2026-09-08
Published