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CVE-2026-62871 is a high-severity out-of-bounds write vulnerability in .NET that can allow unauthorized local code execution. The issue is described in the context of unsafe native interoperability logic in which unmanaged memory is allocated with a fixed 1024-byte heap buffer and attacker-controlled input is copied into that buffer using Marshal.Copy without properly validating the supplied length. Because the length parameter is not constrained to the allocated buffer size or the actual input length, the copy operation can write past the end of the unmanaged allocation, causing heap corruption before the buffer is passed to subsequent native parsing logic. The vulnerable pattern is associated with local exploitation and may result in arbitrary code execution in the security context of the affected application.
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What an attacker gets, and what they’ve been doing with it.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity local vulnerability in .NET native interoperability code involving an out-of-bounds write via unsafe Marshal.Copy usage, leading to privilege escalation and potential full system compromise.
.NET Elevation of Privilege vulnerability.
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.