{"uuid": "55e2a391-fec1-4e4b-91d1-b468fd077ae0", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-62886", "type": "seen", "source": "https://gist.github.com/alon710/c26d8ea35790aa5f894c5093fc4e7295", "content": "# CVE-2026-62886: CVE-2026-62886: .NET Elevation of Privilege Vulnerability via Native Heap Buffer Overflow\n\n> **CVSS Score:** 7.8\n> **Published:** 2026-08-11\n> **Full Report:** https://cvereports.com/reports/CVE-2026-62886\n\n## Summary\nAn integer overflow or wraparound vulnerability (CWE-190) in the native layer of the .NET runtime allows local unauthenticated attackers to corrupt the native heap, leading to a heap-based buffer overflow (CWE-122) and local privilege escalation.\n\n## TL;DR\nAn integer overflow in the native memory allocation logic of the .NET runtime allows a local attacker to trigger a heap-based buffer overflow, leading to local privilege elevation via crafted application inputs.\n\n## Technical Details\n\n- **CWE ID**: CWE-190, CWE-122\n- **Attack Vector**: Local (AV:L)\n- **CVSS Severity**: 7.8 (High)\n- **Exploit Status**: None\n- **KEV Status**: Not Listed\n\n## Affected Systems\n\n- .NET 10.0 Runtime and SDK\n- .NET 9.0 Runtime and SDK\n- .NET 8.0 Runtime and SDK\n- Microsoft Visual Studio 2022\n- Microsoft Visual Studio 2026\n- **.NET 10.0**: >= 10.0.0 and < 10.0.11 (Fixed in: `10.0.11`)\n- **.NET 9.0**: >= 9.0.0 and < 9.0.19 (Fixed in: `9.0.19`)\n- **.NET 8.0**: >= 8.0.0 and < 8.0.30 (Fixed in: `8.0.30`)\n\n## Mitigation\n\n- Update .NET runtimes and SDKs to patched releases\n- Apply least-privilege principles to .NET services and tools\n- Enforce execution control policies on endpoints to prevent untrusted .NET binaries from running\n\n**Remediation Steps:**\n1. Identify all systems running vulnerable versions of .NET and Visual Studio.\n2. Deploy updates for .NET 8.0, 9.0, and 10.0 runtime packages.\n3. Rebuild and redeploy applications bundling custom native dependencies with bounds-checking enabled.\n\n## References\n\n- [Microsoft Security Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62886)\n- [CVE.org Record](https://www.cve.org/CVERecord?id=CVE-2026-62886)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-62886) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-08-11T19:33:56.588720Z"}