Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/freeciv/freeciv
- https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L788
- https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L964
- https://github.com/freeciv/freeciv/commit/75ecde3e86ddf2fe775768450e9a290a4f4d43
- https://github.com/freeciv/freeciv/releases/tag/R3_2_6
- https://redmine.freeciv.org/issues/2161
- https://www.vulncheck.com/advisories/freeciv-before-3.2.6-heap-buffer-overflow-v
FAQ
What is CVE-2026-90556?
CVE-2026-90556 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-90556?
CVE-2026-90556 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-90556?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.