CVE-2026-24783

Date: January 27, 2026

soroban-fixed-point-math is a fixed-point math library for Soroban smart contacts. In versions 1.3.0 and 1.4.0, the "mulDiv(x, y, z)" function incorrectly handled cases where both the intermediate product $x * y$ and the divisor $z$ were negative. The logic assumed that if the intermediate product was negative, the final result must also be negative, neglecting the sign of $z$. This resulted in rounding being applied in the wrong direction for cases where both $x * y$ and $z$ were negative. The functions most at risk are "fixed_div_floor" and "fixed_div_ceil", as they often use non-constant numbers as the divisor $z$ in "mulDiv". This error is present in all signed "FixedPoint" and "SorobanFixedPoint" implementations, including "i64", "i128", and "I256". Versions 1.3.1 and 1.4.1 contain a patch. No known workarounds for this issue are available.