What’s Vulnerable › Vulnerabilities

CVE-2026-90557: Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-12 · updated 2026-09-23
• Weakness: CWE-125

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: from 3.1.0 before 3.2.6 — fixed in 3.2.6

How to fix

Upgrade to a fixed version: freeciv 3.2.6. Check the vendor advisory for mitigations.

References

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

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