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This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\nAn out of bounds write can occur when parsing a Portable PDB file.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/438\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** High\n- **Score:** 8.8\n- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`\n- **Weakness:** CWE-122 (Heap-based Buffer Overflow)\n\n## Affected Platforms\n\n- **Platforms:** Windows\n- **Architectures:** All\n\n## <a name=\"affected-packages\"></a>Affected Packages\nThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below\n\n### <a name=\".NET 11 RC1\"></a>.NET 11 RC1\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.10.0-beta1.24272.1, <= 18.9.0-beta1.26405.1 | 18.9.0-beta1.26405.2\n\n### <a name=\".NET 10\"></a>.NET 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.12.0-beta1.24603.5, <= 18.9.0-beta1.26405.1 | 18.9.0-beta1.26405.2\n\n### <a name=\".NET 9\"></a>.NET 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.12.0-beta1.24603.5, <= 18.9.0-beta1.26405.1 | 18.9.0-beta1.26405.2\n\n### <a name=\".NET 8\"></a>.NET 8\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.DiaSymReader.Native](https://www.nuget.org/packages/Microsoft.DiaSymReader.Native) | >= 17.12.0-beta1.24603.5, <= 18.9.0-beta1.26405.1 | 18.9.0-beta1.26405.2\n\n## Advisory FAQ\n\n### <a name=\"how-affected\"></a>How do I know if I am affected?\n\nIf using a package listed in [affected packages](#affected-packages), a project is exposed to the vulnerability.\n\n### <a name=\"how-fix\"></a>How do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET or Visual Studio.\n2. If a developer's application references Microsoft.DiaSymReader.Native, update the package reference to version 18.9.0-beta1.26405.2 or later.\n\nOnce developers have installed the updated runtime, SDK, Visual Studio, or package, they should restart their apps in order for the update to take effect.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf users have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nUsers can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. Users can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-69439](https://www.cve.org/CVERecord?id=CVE-2026-69439)\n\n### Acknowledgements\n\n41ae55e9310ff27fa6f26af4727e5590\n\n### Revisions\n\nV1.0 (09/08/2026): Advisory published.","state":0,"publishedAt":"2026-09-09T16:03:46+00:00","modifiedAt":"2026-10-01T10:10:51.7553582+00:00","affected":[{"ecosystem":"NuGet","name":"Microsoft.DiaSymReader.Native","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"17.10.0-beta1.24272.1"},{"kind":"fixed","version":"18.9.0-beta1.26405.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/dotnet/runtime/security/advisories/GHSA-527h-q9f6-p7qx","https://github.com/dotnet/runtime","https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69439","https://nvd.nist.gov/vuln/detail/cve-2026-69439"],"sourceUrl":"https://github.com/advisories/GHSA-527h-q9f6-p7qx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-527h-q9f6-p7qx","identifiers":["GHSA-527h-q9f6-p7qx","BIT-dotnet-2026-69439","BIT-dotnet-sdk-2026-69439","CVE-2026-69439"]},"retained":false,"historicalAffected":[]},{"revision":"0951c3ec71f74489bc211a1fc06dff08","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-mqvm-gmc4-6rv2","aliases":[],"title":"Duplicate Advisory: Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability","description":"### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-527h-q9f6-p7qx. This link is maintained to preserve external references.\n\n### Original Description\nHeap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.","state":2,"publishedAt":"2026-09-08T18:32:35+00:00","modifiedAt":"2026-09-09T16:15:05.5238256+00:00","affected":[{"ecosystem":"NuGet","name":"Microsoft.DiaSymReader.Native","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"17.10.0-beta1.24272.1"},{"kind":"fixed","version":"18.9.0-beta1.26405.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-69439","https://github.com/dotnet/runtime","https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69439"],"sourceUrl":"https://github.com/advisories/GHSA-mqvm-gmc4-6rv2","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-mqvm-gmc4-6rv2","identifiers":["GHSA-mqvm-gmc4-6rv2"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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