CVE-2026-14574
Summary
| CVE | CVE-2026-14574 |
|---|---|
| State | PUBLISHED |
| Assigner | eclipse |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-05 11:16:25 UTC |
| Updated | 2026-08-07 16:02:40 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 5.7 MEDIUM from [email protected]
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.002820000 probability, percentile 0.203550000 (date 2026-08-10)
Problem Types: CWE-1321 | CWE-1321 CWE-1321
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 5.7 | MEDIUM | 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/E:X/C... |
| 4.0 | CNA | CVSS | 5.7 | MEDIUM | 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 |
| 3.1 | [email protected] | Primary | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
CVSS v4.0 Breakdown
Attack Vector
LocalAttack Complexity
LowAttack Requirements
PresentPrivileges Required
NoneUser Interaction
ActiveConfidentiality
LowIntegrity
HighAvailability
LowSub Conf.
NoneSub Integrity
LowSub Availability
LowCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Eclipse Foundation | Eclipse Theia | affected 0.7.0 1.74.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| gitlab.eclipse.org/security/vulnerability-reports/-/issues/567 | [email protected] | gitlab.eclipse.org | Exploit, Mitigation, Vendor Advisory, Issue Tracking |
| gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | gitlab.eclipse.org | Exploit, Mitigation, Vendor Advisory |
| github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32 | [email protected] | github.com | Broken Link |
| gitlab.eclipse.org/security/cve-assignment/-/work_items/157 | [email protected] | gitlab.eclipse.org | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Wu Junming (https://gitlab.eclipse.org/dremig) (en)
There are currently no legacy QID mappings associated with this CVE.