# CVE-2026-90557

## Summary

- **CVE ID:** CVE-2026-90557
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-125
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 15, 2026

## Description

Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sg_load_player_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a crash or limited heap memory exposure when loaded.

## Affected Products

- freeciv — freeciv (3.1.0)

## References

- [CNA](https://github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e)
- [CNA](https://github.com/freeciv/freeciv)
- [CNA](https://redmine.freeciv.org/issues/2162)
- [CNA](https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L6108)
- [CNA](https://github.com/freeciv/freeciv/releases/tag/R3_2_6)
- [CNA](https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L4282)
- [CNA](https://www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.5

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._