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High, CVSS 8.4amended

[Eclipse Theia] Arbitrary Command Execution via Untrusted Workspace Task Definitions

CVE-2026-44691GHSA-g9jw-92q7-g7fj

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@theia/workspace 1.69.0; @theia/debug 1.69.0; @theia/task 1.69.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.4 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-44691: 0.41% estimated exploitation activity in the next 30 days; percentile 35.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

In Eclipse Theia versions prior to 1.69.0, custom task definitions in workspace files (e.g. .theia/tasks.json, .vscode/tasks.json) could be executed without requiring workspace trust. An attacker could craft a malicious repository that, when cloned and opened in Theia, leads to execution of arbitrary commands with the user's privileges. In combination with AI chat features and a workspace .theia/settings.json that disabled tool confirmation, this could be triggered automatically by sending a message in the AI chat.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-g9jw-92q7-g7fj

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-g9jw-92q7-g7fj

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-44691

Advisory: [Eclipse Theia] Arbitrary Command Execution via Untrusted Workspace Task Definitions
IDs: CVE-2026-44691, GHSA-g9jw-92q7-g7fj
Record: https://patchnext.com/advisories/cve-2026-44691 (revision 3, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @theia/workspace 1.69.0; @theia/debug 1.69.0; @theia/task 1.69.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @theia/workspace: affected < 1.69.0; fixed in 1.69.0
- npm @theia/debug: affected < 1.69.0; fixed in 1.69.0
- npm @theia/task: affected < 1.69.0; fixed in 1.69.0

## Suggested inspection (read-only)
- `npm ls @theia/workspace --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @theia/debug --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @theia/task --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @theia/workspace, @theia/debug, @theia/task.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-g9jw-92q7-g7fj (OSV record GHSA-g9jw-92q7-g7fj lists affected ranges: npm @theia/debug >=0 =0 =0 <1.69.0 (fixed))
- Verified: https://github.com/advisories/GHSA-g9jw-92q7-g7fj (GitHub-reviewed advisory GHSA-g9jw-92q7-g7fj lists affected ranges: npm @theia/debug >=0 =0 =0 <1.69.0)

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