# CVE-2026-24783

## Summary

- **CVE ID:** CVE-2026-24783
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-682
- **Published:** Jan 27, 2026
- **Last Modified:** Mar 12, 2026

## Description

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.

## Affected Products

- script3 — soroban-fixed-point-math (= 1.4.0)
- script3 — soroban-fixed-point-math (= 1.3.0)

## References

- [CNA](https://github.com/script3/soroban-fixed-point-math/security/advisories/GHSA-x5m4-43jf-hh65)
- [CNA](https://github.com/script3/soroban-fixed-point-math/commit/c9233f7094198a49ed66a4d75786a8a3755c936a)
- [CNA](https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.3.1)
- [CNA](https://github.com/script3/soroban-fixed-point-math/releases/tag/v1.4.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._