Prototype Pollution Vulnerability in Eclipse Theia by Eclipse Foundation
CVE-2026-14574

5.7MEDIUM

Key Information:

Vendor

Eclipse Foundation

Status
Eclipse Theia
Vendor
CVE Published:
5 August 2026

What is CVE-2026-14574?

In specific versions of Eclipse Theia, the PreferenceUtils.merge function poses a risk by allowing for the merging of preference values that can introduce prototype-related keys such as __proto__, constructor, and prototype. This vulnerability occurs because it is invoked during preference resolution across various scopes including user and workspace settings. If an attacker crafts an entry in a workspace settings file, it can lead to pollution of Object.prototype, potentially leading to undesirable effects on application logic when the workspace is accessed.

Affected Version(s)

Eclipse Theia 0.7.0 < 1.74.0

References

https://github.com/eclipse-theia/theia/security/advisorie...
https://gitlab.eclipse.org/security/vulnerability-reports...
https://gitlab.eclipse.org/security/cve-assignment/-/work...

CVSS V4

Score:
5.7
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Wu Junming (https://gitlab.eclipse.org/dremig)
.