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CVE-2026-90556— Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load

Quick assessment

Affected
freeciv freeciv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeCiv 版本在 3.2.6 之前的版本中， 函数在处理声明的工作列表长度超过固定数组边界（64 个元素）的存档文件时，存在堆缓冲区溢出漏洞。攻击者可以构造恶意的存档文件，使得写入操作越过 数组的范围，写入到相邻的堆分配结构体字段，从而可能导致内存损坏，当用户或服务器管理员加载该文件时触发。

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
freeciv freeciv < 3.2.6 affected
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I. Basic Information for CVE-2026-90556

Vulnerability Information
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Vulnerability Title
Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
freeciv freeciv 0 ~ 3.2.6 -

II. Public POCs for CVE-2026-90556

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III. Intelligence Information for CVE-2026-90556

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Patches & Fixes for CVE-2026-90556 (1)

Vendor Advisories for CVE-2026-90556 (1)

Vendor Pages for CVE-2026-90556 (2)

Other References for CVE-2026-90556 (1)

IV. Related Vulnerabilities

Same product: freeciv
Same vendor: freeciv
Same weakness: CWE-122

V. Comments for CVE-2026-90556

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