CVE-2026-90557 Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame
An attacker can cause a crash or expose heap memory by tricking a user into loading a malicious savegame file in Freeciv.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-90557?
CVE-2026-90557 is a medium-severity memory corruption vulnerability in freeciv, published on 12 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-90557?
How do I fix CVE-2026-90557?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90557 being exploited?
There is no known exploitation of CVE-2026-90557 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90557, GHSA-m27m-5mqj-h84f, UBUNTU-CVE-2026-90557.