Vulnerability in Microsoft.DiaSymReader.Native (CVE-2026-69522)
Summary
Vulnerability in Microsoft.DiaSymReader.Native (CVE-2026-69522). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 18.9.0-beta1.26405.2 or later.
Original description
The description as published by the source.
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:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - 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 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 | >= 17.10.0-beta1.24272.1, <= 18.9.0-beta1.26405.1 | 18.9.0-… |
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-69522 has been found in Microsoft.DiaSymReader.Native.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade Microsoft.DiaSymReader.Native to 18.9.0-beta1.26405.2 or later.
If unsure, ask your IT team or search "Microsoft.DiaSymReader.Native CVE-2026-69522" on the vendor's site.
CVE-2026-69522 (Microsoft.DiaSymReader.Native) — CWE-122 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Patched: 18.9.0-beta1.26405.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-122) exists in Microsoft.DiaSymReader.Native.
Check the vendor advisory for the affected versions of Microsoft.DiaSymReader.Native.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 18.9.0-beta1.26405.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Microsoft.DiaSymReader.Native' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Microsoft.DiaSymReader.Native' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Microsoft.DiaSymReader.Nativeを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Microsoft.DiaSymReader.Native to 18.9.0-beta1.26405.2ステージング環境で 18.9.0-beta1.26405.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web secure@microsoft.com
- web github.com
- web github.com