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CVE-2026-14574

Published: Aug 5, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-1321
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 79.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-1321

Affected Products

eclipse
oss-project·BEaka eclipse-foundation
theia
DevTools & CI
Eclipse Foundation
oss-project·DE
Eclipse Theia
OSS Libraries

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32
github.com
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157
gitlab.eclipse.org
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567
gitlab.eclipse.org
and 1 more references View all →

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