AIKIDO-2026-401924
bigdecimal is vulnerable to Out-of-bounds Write
39
Low Risk
This Affects:
bigdecimalTL;DR
BigDecimal division routes higher-precision operations through a Newton-Raphson algorithm whose slice_copy helper in div.h computes copy offsets that can fall outside the source fraction buffer. When operand magnitude and precision produce a negative or oversized start index, slice_copy performs a heap memcpy past the bounds of the frac array, corrupting adjacent heap memory. Zero-valued intermediate results also retain stale exponents, compounding the miscalculation during division. The fix clamps the copy range to the valid window and normalizes the exponent of zero values.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application performs division on BigDecimal values whose magnitude or precision can be influenced by untrusted input.
Background info
bigdecimal is vulnerable to Out-of-bounds Write in versions 4.1.0 - 4.1.2.
How to fix this
Upgrade the bigdecimal library to the patch version.
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