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How the CVE Works
The vulnerability occurs in MemBump::new(), which allocates memory without proper initialization. When subsequent `alloc` methods are called, they read and write from the uninitialized memory region as a Cell, leading to undefined behavior. This could potentially expose uninitialized memory or violate type invariants, causing assertion failures. The fix involves zero-initializing the allocated memory to prevent such reads.
DailyCVE Form
Platform: GitHub
Version: Pre-commit d8d6a7d
Vulnerability: Uninitialized Read
Severity: Low
Date: Jul 11, 2025
Prediction: Patch expected by Jul 18, 2025
What Undercode Say
// Vulnerable Code let mem = MemBump::new(); // Uninitialized allocation mem.alloc(); // Reads undefined memory // Fixed Code let mem = MemBump::new(); // Zero-initialized mem.alloc(); // Safe read
How Exploit
- Trigger uninitialized read via `MemBump::alloc()`
– Potential info leak if uninitialized memory is exposed - May cause assertion failures due to invalid invariants
Protection from this CVE
- Update to post-commit d8d6a7d
- Manually call `MemBump::reset()` after allocation
Impact
- Low risk of memory exposure
- Possible program instability
- No known remote exploitation
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
