{"id":"CVE-2026-14574","state":"PUBLISHED","title":"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 prototyp","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.","publishedAt":"2026-08-05T10:51:47.869Z","updatedAt":"2026-08-05T13:05:29.371Z","severity":{"score":5.7,"label":"Medium","version":"4.0","vector":"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":"eclipse"},"assigner":"eclipse","products":["Eclipse Foundation Eclipse Theia"],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Theia","defaultStatus":"unaffected","versions":[{"version":"0.7.0","status":"affected","lessThan":"1.74.0","versionType":"semver"}]}],"references":["https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32","https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567","https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157","https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567"],"weaknesses":["CWE-1321"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/14xxx/CVE-2026-14574.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-14574","state":"PUBLISHED","datePublished":"2026-08-05T10:51:47.869Z","dateUpdated":"2026-08-05T13:05:29.371Z","assignerShortName":"eclipse","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateReserved":"2026-07-03T11:09:54.712Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Theia","defaultStatus":"unaffected","versions":[{"version":"0.7.0","status":"affected","lessThan":"1.74.0","versionType":"semver"}]}],"references":[{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32"},{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567"},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"LOW","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.7,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321","type":"CWE"}]}],"providerMetadata":{"shortName":"eclipse","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateUpdated":"2026-08-05T10:51:47.869Z"},"impacts":[{"capecId":"CAPEC-77","descriptions":[{"lang":"en","value":"CAPEC-77"}]}],"credits":[{"lang":"en","value":"Wu Junming (https://gitlab.eclipse.org/dremig)","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-05T13:04:59.354596Z","id":"CVE-2026-14574","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-05T13:05:29.371Z"}}]}}}