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CVE-2026-90557— Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame

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 3.1.0版本至3.2.5版本存在缓冲区错误漏洞，该漏洞源于sg_load_player_unit()函数在处理包含无效单位活动索引的存档文件时存在越界读取，攻击者可构造带有越界活动索引的恶意存档文件绕过边界检查，导致崩溃或有限堆内存暴露。

CVSS 6.1 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
freeciv freeciv 3.1.0< 3.2.6 affected
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I. Basic Information for CVE-2026-90557

Vulnerability Information
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Vulnerability Title
Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame
Source: CVE Program / CVE List V5
Vulnerability Description
Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sg_load_player_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a crash or limited heap memory exposure when loaded.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 3.1.0版本至3.2.5版本存在缓冲区错误漏洞，该漏洞源于sg_load_player_unit()函数在处理包含无效单位活动索引的存档文件时存在越界读取，攻击者可构造带有越界活动索引的恶意存档文件绕过边界检查，导致崩溃或有限堆内存暴露。
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 3.1.0 ~ 3.2.6 -

II. Public POCs for CVE-2026-90557

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-90557

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Patches & Fixes for CVE-2026-90557 (1)

Vendor Advisories for CVE-2026-90557 (1)

Vendor Pages for CVE-2026-90557 (2)

Other References for CVE-2026-90557 (1)

IV. Related Vulnerabilities

Same product: freeciv
Same vendor: freeciv
Same weakness: CWE-125

V. Comments for CVE-2026-90557

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