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CVE-2026-14574

Quick assessment

Affected
Eclipse Foundation Eclipse Theia
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.

Eclipse Theia是美国Eclipse基金会开源的一个可构建云端及桌面集成开发环境的开发框架。 Eclipse Theia 0.7.0版本至1.73.1版本存在输入验证错误漏洞，该漏洞源于PreferenceUtils.merge函数在递归合并偏好值时未拒绝原型相关键（__proto__、constructor、prototype），导致攻击者可通过工作区设置文件（.theia/settings.json或.vscode/settings.json）污染Object.prototype，从而改变应

CVSS 5.7 · Medium EPSS 0.40% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse Theia 0.7.0< 1.74.0 affected
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I. Basic Information for CVE-2026-14574

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia/core` recursively merges preference values without rejecting prototype-related keys (`__proto__`, `constructor`, `prototype`). Because this function is invoked by `PreferenceServiceImpl.doResolve` for every preference resolution across scopes (default, user, workspace, folder), a crafted preference value in a workspace settings file (`.theia/settings.json` or `.vscode/settings.json`) can pollute `Object.prototype` when the user opens the workspace, potentially altering application logic across the Theia process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Eclipse Theia 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Theia是美国Eclipse基金会开源的一个可构建云端及桌面集成开发环境的开发框架。 Eclipse Theia 0.7.0版本至1.73.1版本存在输入验证错误漏洞，该漏洞源于PreferenceUtils.merge函数在递归合并偏好值时未拒绝原型相关键（__proto__、constructor、prototype），导致攻击者可通过工作区设置文件（.theia/settings.json或.vscode/settings.json）污染Object.prototype，从而改变应
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
Eclipse Foundation Eclipse Theia 0.7.0 ~ 1.74.0 -

II. Public POCs for CVE-2026-14574

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III. Intelligence Information for CVE-2026-14574

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Patches & Fixes for CVE-2026-14574 (1)

Vendor Advisories for CVE-2026-14574 (2)

Same Patch Batch · Eclipse Foundation · 2026-08-05 · 6 CVEs total

CVE-2026-60009 8.8 HIGH Eclipse Theia 路径遍历漏洞
CVE-2026-12609 7.5 HIGH Eclipse Theia 路径遍历漏洞
CVE-2026-61891 7.5 HIGH Eclipse Theia 信息泄露漏洞
CVE-2026-14304 4.6 MEDIUM Eclipse Accessibility Tools Framework 输入验证错误漏洞
CVE-2026-46581 Eclipse Mojarra 路径遍历漏洞

IV. Related Vulnerabilities

Same product: Eclipse Theia
Same vendor: Eclipse Foundation
Same weakness: CWE-1321

V. Comments for CVE-2026-14574

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