{"id":"CVE-2026-14574","published":"2026-08-05T11:16:25.030","lastModified":"2026-08-07T16:02:40.473","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cwes":["CWE-1321"],"vendors":["eclipse"],"products":["theia"],"references":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32","tags":["Broken Link"]},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157","tags":["Vendor Advisory"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567","tags":["Exploit","Mitigation","Vendor Advisory","Issue Tracking"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567","tags":["Exploit","Mitigation","Vendor Advisory"]}],"exploitRefs":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32","tags":["Broken Link"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567","tags":["Exploit","Mitigation","Vendor Advisory","Issue Tracking"]},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567","tags":["Exploit","Mitigation","Vendor Advisory"]}],"hasPoc":true,"ai":null}