AIKIDO-2026-227377
Microsoft.Diagnostics.Tracing.TraceEvent is vulnerable to Out-of-bounds Read
55
Medium Risk
This Affects:
Microsoft.Diagnostics.Tracing.TraceEventTL;DR
The CLR trace parser reads the number of map entries for a MethodILToNativeMap event directly from the event payload without validating it against the actual payload size. A malformed or inflated entry count causes the offset accessors to read past the end of the event data. This produces out-of-bounds native memory reads and an uncatchable AccessViolationException that crashes the process. The fix validates that the payload is large enough for the declared entry count before the data is read.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application uses the library to parse untrusted or externally supplied ETW or EventPipe trace data containing CLR method events.
Background info
Microsoft.Diagnostics.Tracing.TraceEvent is vulnerable to Out-of-bounds Read in versions 1.0.3 - 3.2.5.
How to fix this
Upgrade the Microsoft.Diagnostics.Tracing.TraceEvent library to the patch version.
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SOC 2Compliant
ISO 27001Compliant