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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是Freeciv团队开源的一款面向前端开发并支持脚本语言扩展的程序库。 Freeciv 3.2.6之前版本存在缓冲区错误漏洞，该漏洞源于worklist_load()处理存档文件时，声明的worklist长度超过固定数组边界64个元素，导致堆缓冲区溢出，攻击者可制作恶意存档文件写入entries数组之外的相邻堆分配结构字段，可能导致用户或服务器操作员加载文件时内存损坏。

CVSS 7.8 · High EPSS 0.20% · P9

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
Vulnerability Title
Freeciv 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Freeciv是Freeciv团队开源的一款面向前端开发并支持脚本语言扩展的程序库。 Freeciv 3.2.6之前版本存在缓冲区错误漏洞，该漏洞源于worklist_load()处理存档文件时，声明的worklist长度超过固定数组边界64个元素，导致堆缓冲区溢出，攻击者可制作恶意存档文件写入entries数组之外的相邻堆分配结构字段，可能导致用户或服务器操作员加载文件时内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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