AIKIDO-2026-359665
cxx is vulnerable to Use of Uninitialized Variable
28
Low Risk
This Affects:
cxxTL;DR
The let_cxx_string! macro in the cxx crate has an exception safety vulnerability where a StackString is created before the match expression evaluates, and if that expression panics, the uninitialized StackString's drop implementation unconditionally deinitializes uninitialized memory, causing segmentation faults. The fix is non-trivial because simply reordering initialization doesn't work—the init() method itself can panic when calling user-provided AsRef implementations, perpetuating the soundness issue.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
cxx is vulnerable to Use of Uninitialized Variable in versions 0.0.1 - 1.0.195.
How to fix this
Upgrade the cxx library to the patch version.
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