{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0.7.0"
              },
              {
                "fixed": "1.74.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE"
            ]
          },
          "events": [
            {
              "introduced": "b67025d7165c8a3f0b7170efb044263992593813"
            },
            {
              "fixed": "172494ea2564ca07690e230805861146007fae79"
            }
          ],
          "repo": "https://github.com/eclipse-theia/theia",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-f3w9-qfw3-xr32"
  ],
  "database_specific": {
    "cna_assigner": "eclipse",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14574.json"
  },
  "details": "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.",
  "id": "CVE-2026-14574",
  "modified": "2026-08-09T03:30:43.962865814Z",
  "published": "2026-08-05T10:51:47.869Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14574.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14574"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567"
    },
    {
      "type": "EVIDENCE",
      "url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}