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CVE-2026-69439 is a CWE-122 heap-based buffer overflow in .NET and Visual Studio associated with parsing specially crafted Portable PDB data through Microsoft.DiaSymReader.Native and related packages. Malformed metadata stream headers can cause an attacker-controlled block count to produce an undersized heap allocation, followed by out-of-bounds writes while parsing the declared blocks. The corruption can affect adjacent heap objects and control-flow-relevant pointers, enabling code execution in the affected process and resulting in elevation of privilege.
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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.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer-overflow-driven heap buffer overflow in a native metadata parser. A malicious metadata stream can cause the parser to allocate an undersized heap buffer and copy the full attacker-controlled payload into it, enabling adjacent pointer/vtable corruption and potential arbitrary code execution in the host process.
A high-severity elevation-of-privilege vulnerability in Microsoft.DiaSymReader.Native, caused by an out-of-bounds write while parsing a Portable PDB file. It affects Windows .NET projects using vulnerable package versions.
A heap-based buffer-overflow vulnerability in Microsoft.DiaSymReader.Native, affecting .NET and Visual Studio, that can allow an unauthenticated attacker to elevate privileges over a network.
A high-severity elevation-of-privilege vulnerability affecting the Microsoft.DiaSymReader.Native library and related .NET/Visual Studio packages.
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.