CVE-2026-90556

high

Description

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

References

https://www.vulncheck.com/advisories/freeciv-before-3.2.6-heap-buffer-overflow-via-worklist-load

https://redmine.freeciv.org/issues/2161

https://github.com/freeciv/freeciv/releases/tag/R3_2_6

https://github.com/freeciv/freeciv/commit/75ecde3e86ddf2fe775768450e9a290a4f4d4387

https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L964

https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L788

https://github.com/freeciv/freeciv

Details

Source: Mitre, NVD

Published: 2026-09-12

Updated: 2026-09-12

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.5

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: High