{"uuid": "e736a6ed-a67f-4b8f-b631-f1a91c3a0a68", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-71328", "type": "seen", "source": "https://gist.github.com/alon710/8374dc4a29b228e57cf7d4fb6119acf4", "content": "# CVE-2026-71328: CVE-2026-71328: Heap-Based Buffer Overflow in Microsoft .NET and Visual Studio Parser\n\n> **CVSS Score:** 8.8\n> **Published:** 2026-09-09\n> **Full Report:** https://cvereports.com/reports/CVE-2026-71328\n\n## Summary\nA heap-based buffer overflow vulnerability (CVE-2026-71328) exists within the parser component of Microsoft Visual Studio and Microsoft .NET runtimes. This vulnerability permits an unauthenticated remote attacker to execute arbitrary code with the privileges of the running application, provided they can convince a user to load a maliciously crafted project file, solution, or stream.\n\n## TL;DR\nHeap-based buffer overflow in Microsoft .NET and Visual Studio parser components allows remote code execution via a maliciously crafted project, solution, or stream file.\n\n## Technical Details\n\n- **CVE ID**: CVE-2026-71328\n- **Weakness**: CWE-122 (Heap-based Buffer Overflow)\n- **CVSS Score**: 8.8 (High)\n- **CVSS Vector**: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\n- **Exploit Status**: Unproven / None\n- **KEV Status**: Not Listed\n\n## Affected Systems\n\n- .NET 8.0\n- .NET 9.0\n- .NET 10.0\n- .NET 11.0\n- Visual Studio 2022\n- Visual Studio 2026\n\n## Mitigation\n\n- Apply official vendor security updates immediately\n- Restrict opening of unverified solution and project files\n- Use application control solutions to restrict child processes spawned by Visual Studio\n- Isolate untrusted code compilation within sandbox environments\n\n**Remediation Steps:**\n1. Identify all active Visual Studio and .NET installations on developer machines and servers\n2. Download and apply the security updates corresponding to the installed versions (e.g., .NET 8.0.31, .NET 9.0.20, Visual Studio 2022 v17.14.40)\n3. Verify patch levels by querying version strings via CLI or administration tools\n4. Enforce software restriction policies to block unauthorized command execution from IDE processes\n\n## References\n\n- [Microsoft Security Response Center (MSRC) Advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71328)\n- [CVE.org Authoritative Vulnerability Page](https://www.cve.org/CVERecord?id=CVE-2026-71328)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-71328) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-09-09T21:32:25.751498Z"}