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Vulnerabilities

Vulnerability · CVE-2026-69522

Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution Vulnerability

Published Sep 9, 2026 · catalog updated Nov 4, 2026 · Microsoft Security Advisory –

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-69522. EPSS is 0.84%. Act only if a listed version of Microsoft Security Advisory – is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Microsoft Security Advisory –).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.84%
Remediation
Advisory link
Affected products
NuGet Microsoft.DiaSymReader.Native

# Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution 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 processing PDB files. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/439 ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 8.8 - **Vector:** - **Weakness:** CWE-122 (Heap-based Buffer Overflow) ## Affected Platforms - **Platforms:** Windows - **Architectures:** All ## Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below Supported .NET Framework versions listed in the [Microsoft Security Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69522) are also affected. Install the September 2026 .NET Framework security update applicable to a project's Windows version. ### .NET 11 RC1 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.10.0-beta1.24272.1, .NET 10 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.12.0-beta1.24603.5, .NET 9 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.12.0-beta1.24603.5, .NET 8 Package name | Affected version | Patched version ------------ | ---------------- | ----------------------

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • NuGet Microsoft.DiaSymReader.Native17.10.0-beta1.24272.1 → 18.9.0-beta1.26405.2

How to fix CVE-2026-69522

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-69522. EPSS is 0.84%. Act only if a listed version of Microsoft Security Advisory – is installed.

Which versions are affected?

Compare what you have installed with Microsoft.DiaSymReader.Native 17.10.0-beta1.24272.1 → 18.9.0-beta1.26405.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow. EPSS 0.84%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 9, 2026 · GitHub Advisory Database

    Detected

    # Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution 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

  2. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.DiaSymReader.Native fixed in 18.9.0-beta1.26405.2

  3. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.DiaSymReader.Native fixed in 18.9.0-beta1.26405.2

  4. Nov 4, 2026 · GitHub Advisory Database

    Updated

    # Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution 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

Sources

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseNov 6, 2026
  • OpenSSF OSV / OSV ScannerNov 6, 2026
  • CVE.orgNov 4, 2026