{"uuid": "f83e2772-e4d6-45b4-bcd3-3c580170ce48", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-69439", "type": "seen", "source": "https://gist.github.com/alon710/dc89ae520cd13baa7afe1536567d4bae", "content": "# CVE-2026-69439: CVE-2026-69439: Heap-based Buffer Overflow in Microsoft .NET and Visual Studio\n\n> **CVSS Score:** 8.8\n> **Published:** 2026-09-09\n> **Full Report:** https://cvereports.com/reports/CVE-2026-69439\n\n## Summary\nCVE-2026-69439 is a high-severity elevation of privilege vulnerability in Microsoft .NET and Visual Studio, originating from a heap-based buffer overflow (CWE-122) within native parsing libraries. An unauthenticated attacker can achieve code execution under the privileges of the active process by convincing a user to open a specially crafted project, metadata stream, or dependency.\n\n## TL;DR\nAn integer overflow in the native parsing components of .NET and Visual Studio allows network-based attackers to execute arbitrary code and elevate privileges when a user opens a maliciously crafted file.\n\n## Technical Details\n\n- **Vulnerability Type**: CWE-122: Heap-based Buffer Overflow\n- **Attack Vector**: Network (AV:N)\n- **Attack Complexity**: Low (AC:L)\n- **Privileges Required**: None (PR:N)\n- **User Interaction**: Required (UI:R)\n- **Scope**: Unchanged (S:U)\n- **Impact Score**: 5.9\n- **Exploit Status**: None (Unproven)\n\n## Affected Systems\n\n- Microsoft .NET Runtime and SDK environments\n- Microsoft Visual Studio 2022 development environment\n- Microsoft Visual Studio 2026 development environment\n- Hosts running custom applications using low-level .NET native integration\n- **.NET 8.0**: 8.0.0 to < 8.0.31 (Fixed in: `8.0.31`)\n- **.NET 9.0**: 9.0.0 to < 9.0.20 (Fixed in: `9.0.20`)\n- **.NET 10.0**: 10.0.0 to < 10.0.12 (Fixed in: `10.0.12`)\n- **.NET 11.0**: 11.0.0 to < 11.0 RC1 (Fixed in: `11.0 RC1`)\n- **Visual Studio 2022**: 17.14.0 to < 17.14.40 (Fixed in: `17.14.40`)\n- **Visual Studio 2026**: 18.9.0 to < 18.9.3 (Fixed in: `18.9.3`)\n\n## Mitigation\n\n- Apply official vendor patches immediately to development environments and runtime environments\n- Validate the integrity and source of imported solution files, templates, and NuGet packages\n- Utilize software restriction policies to limit the execution of unverified binaries\n- Enforce least privilege principles for developer accounts and execution contexts\n\n**Remediation Steps:**\n1. Identify all installed .NET runtimes, SDKs, and Visual Studio instances\n2. Download and install security updates matching the architecture and version requirements\n3. Verify deployment by cross-checking active dll and runtime versions against the patched thresholds\n\n## References\n\n- [Microsoft Security Response Center Advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69439)\n- [CVE.org Official Vulnerability Details](https://www.cve.org/CVERecord?id=CVE-2026-69439)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-69439) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-09-09T20:31:42.129148Z"}