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.
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Wed, 05 Aug 2026 13:30:00 +0000
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ssvc
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Wed, 05 Aug 2026 13:15:00 +0000
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| Title | Prototype Pollution via Preference Merge in Eclipse Theia Settings |
Wed, 05 Aug 2026 12:45:00 +0000
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Eclipse
Eclipse theia |
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Eclipse
Eclipse theia |
Wed, 05 Aug 2026 11:15:00 +0000
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| 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. | |
| Weaknesses | CWE-1321 | |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: eclipse
Published: 2026-08-05T10:51:47.869Z
Updated: 2026-08-05T13:05:29.371Z
Reserved: 2026-07-03T11:09:54.712Z
Link: CVE-2026-14574
Updated: 2026-08-05T13:05:25.814Z
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