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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| Microsoft.DiaSymReader.Native | nuget | >= 17.10.0-beta1.24272.1, <= 18.9.0-beta1.26405.1 | 18.9.0-beta1.26405.2 |
Miggo AIRoot Cause AnalysisThe analysis of CVE-2026-69439 indicates a heap-based buffer overflow vulnerability in Microsoft.DiaSymReader.Native when parsing Portable PDB files. Despite extensive searching for the specific commit SHA provided in the advisories across various GitHub repositories (dotnet/runtime, dotnet/symreader, and a general GitHub commit search), the patch details could not be directly retrieved. This suggests the commit might reside in a private Microsoft repository or the SHA is an internal identifier.
However, the vulnerability description is quite specific: 'An out of bounds write can occur when parsing a Portable PDB file.' Further, an external security analysis (from herodevs.com) explicitly mentions 'While composing source information for a PDB, PortablePDB::'. This provides a strong indication of the vulnerable component and the type of operation involved.
Based on this information, the vulnerability is located within a C++ class named PortablePDB (as indicated by PortablePDB::) and specifically within a function responsible for 'composing' or writing 'source information' into memory. A heap-based buffer overflow implies that this function performs a write operation without adequate size validation, allowing an attacker to supply malformed input that exceeds the allocated buffer's capacity. Therefore, a function like PortablePDB::ComposeSourceInformation is the most probable candidate for the vulnerable code, as it would be directly involved in processing and writing potentially untrusted data from a PDB file into a heap-allocated buffer. The file path is a placeholder as the exact repository and file structure could not be determined without the patch.
PortablePDB::ComposeSourceInformationsrc/PortablePDB.cpp