What the developer wrote
Authored by odudex
Maixpy deflateIO: Change decompress wbits to 10
What changed, and why it matters
This commit changes a single setting (wbits from an unknown value to 10) in the MaixPy firmware's deflateIO decompression code. The wbits parameter controls the size of the compression window. Without seeing the actual diff or any vendor explanation, we cannot tell whether this fixes a security bug, improves compatibility, or is just a tuning change. The change is too small and lacks context to confidently classify as a security fix.
Obtain the actual diff and any related issue/PR discussion to determine whether this change addresses a decompression vulnerability (e.g., buffer overflow, incorrect window size handling) or is a benign configuration adjustment. If it is a security fix, request a CVE and advisory from the vendor.
Security signals we found
Single-parameter change in decompression code
wbits parameter can affect memory allocation and decompression behavior
No commit message or reference indicates security relevance
No diff available to assess original value or code context
Evidence from the diff
The commit modifies firmware/MaixPy, changing the decompress wbits parameter to 10 in the deflateIO implementation. In zlib/deflate, wbits determines the window size used during decompression. Values outside the valid range for a given compressed stream can cause decompression failures or, in some implementations, memory corruption. A value of 10 corresponds to a 1KB window (2^10), which is valid for raw deflate. However, without the original value, the surrounding code, or any vendor/security reference, this could equally be a compatibility or performance tweak rather than a vulnerability fix.
Changed components
firmware/MaixPy deflateIO decompression moduleInspect captured patch +1 / −1
Diff not available from the source API.Why this scored 24/100
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