CVE-2021-34436

CRITICAL 9.8CVE-2021-34436 · Published 02/09/2021 · updated 17/06/2026

In short

CVE-2021-34436 is a CRITICAL (CVSS 9.8) vulnerability affecting theia (eclipse).
Chance of exploitation in the next 30 days (EPSS): 2.2%, higher than 82.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
theia eclipse	`≥ 0.1.1, ≤ 0.2.0`	No fix yet

Description

In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.

References

bugs.eclipse.org/bugs/show_bug.cgi · Vendor Advisory

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Package

Affected versions

Patched versions

theia

eclipse

≥ 0.1.1, ≤ 0.2.0

No fix yet

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