Vulnerability Details CVE-2026-14574
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.4%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-14574
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cpe:2.3:a:eclipse:theia:0.10.0
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cpe:2.3:a:eclipse:theia:0.11.0
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cpe:2.3:a:eclipse:theia:0.12.0
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cpe:2.3:a:eclipse:theia:0.13.0
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cpe:2.3:a:eclipse:theia:0.14.0
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cpe:2.3:a:eclipse:theia:0.15.0
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cpe:2.3:a:eclipse:theia:0.16.0
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cpe:2.3:a:eclipse:theia:0.16.1
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cpe:2.3:a:eclipse:theia:0.7.0
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cpe:2.3:a:eclipse:theia:0.7.1
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cpe:2.3:a:eclipse:theia:0.7.2
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cpe:2.3:a:eclipse:theia:0.8.0
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cpe:2.3:a:eclipse:theia:0.9.0
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cpe:2.3:a:eclipse:theia:1.1.0
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cpe:2.3:a:eclipse:theia:1.10.0
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cpe:2.3:a:eclipse:theia:1.11.0
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cpe:2.3:a:eclipse:theia:1.12.0
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cpe:2.3:a:eclipse:theia:1.12.1
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cpe:2.3:a:eclipse:theia:1.14.0
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cpe:2.3:a:eclipse:theia:1.15.0
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cpe:2.3:a:eclipse:theia:1.16.0
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cpe:2.3:a:eclipse:theia:1.17.0
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cpe:2.3:a:eclipse:theia:1.17.1
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cpe:2.3:a:eclipse:theia:1.17.2
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cpe:2.3:a:eclipse:theia:1.18.0
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cpe:2.3:a:eclipse:theia:1.19.0
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cpe:2.3:a:eclipse:theia:1.2.0
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cpe:2.3:a:eclipse:theia:1.3.0
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cpe:2.3:a:eclipse:theia:1.4.0
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cpe:2.3:a:eclipse:theia:1.5.0
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cpe:2.3:a:eclipse:theia:1.6.0
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cpe:2.3:a:eclipse:theia:1.7.0
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cpe:2.3:a:eclipse:theia:1.8.0
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cpe:2.3:a:eclipse:theia:1.8.1
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cpe:2.3:a:eclipse:theia:1.9.0