---
cve: "CVE-2026-14574"
severity: "MEDIUM"
cvss: 5.7
epss: "0.3%"
vendor: "Eclipse Foundation"
kev: false
exploited: false
published: "2026-08-05 11:16:25"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T15:26:51+02:00"
---

# CVE-2026-14574

> 5.7 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 172494ea2564ca07690e230805861146007fae79 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-14574) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_