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CVE-2026-32177 is an elevation-of-privilege vulnerability in the .NET runtime caused by a heap-based buffer overflow, with associated improper input validation conditions. The flaw allows data to be written beyond the bounds of a heap-allocated buffer in the runtime’s native layer, which can corrupt adjacent heap metadata or objects. Microsoft rated the issue Important and disclosed it in May 2026. The vulnerability affects .NET 10.0, .NET 9.0, .NET 8.0, and multiple supported .NET Framework versions including 3.5, 4.6.2, 4.7, 4.7.2, 4.8, and 4.8.1. Successful exploitation requires local access and user interaction, but no prior privileges.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Another .NET-related CVE mentioned only for contrast with CVE-2026-35433 and as part of the same Patch Tuesday cycle.
An elevation of privilege vulnerability affecting multiple supported .NET and .NET Framework versions, fixed in the May 2026 servicing updates.
A heap-based buffer overflow and improper input validation vulnerability in the .NET runtime that can allow local privilege escalation on affected .NET, .NET Framework, and bundled Visual Studio installations.
A .NET elevation of privilege vulnerability caused by a heap-based buffer overflow and improper input validation, allowing an unauthorized attacker to elevate privileges locally with user interaction required.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.