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CVE-2026-90557

6.1 · MEDIUM

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.

Published Sep 12, 2026CWE-125EPSS 0.18%

Overview

CVE-2026-90557 is a medium-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/freeciv/freecivGitHubgithub.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L4282GitHubgithub.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L6108GitHubgithub.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152eGitHubgithub.com/freeciv/freeciv/releases/tag/R3_2_6Refredmine.freeciv.org/issues/2162Refwww.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90557?

CVE-2026-90557 is a medium-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-90557?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90557?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90557?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90557 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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