CVE-2026-90556CWE-122

CVE-2026-90556

High · published September 12, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
9.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
8.5 · 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
EPSS
0.00202 · 9.5th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-09-12T22:16Z
References (7)
https://github.com/freeciv/freeciv · [email protected]https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L788 · [email protected]https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L964 · [email protected]https://github.com/freeciv/freeciv/commit/75ecde3e86ddf2fe775768450e9a290a4f4d4387 · [email protected]https://github.com/freeciv/freeciv/releases/tag/R3_2_6 · [email protected]https://redmine.freeciv.org/issues/2161 · [email protected]https://www.vulncheck.com/advisories/freeciv-before-3.2.6-heap-buffer-overflow-via-worklist-load · [email protected]
EPSS history
Timeline
  • 15 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 12 SEP 18:06Z
    Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load
    cvelistv5