🚨 [security] Update vitest 4.0.15 → 4.1.8 (minor)#14

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ vitest (4.0.15 → 4.1.8) · Repo

Security Advisories 🚨

🚨 When Vitest UI server is listening, arbitrary file can be read and executed

Summary

Arbitrary file can be read on Windows when Vitest UI server is listening, especially when exposed to the network.

Impact

Only users that match either of the following conditions are affected:

explicitly exposes the Vitest UI server to the network (using --api.host or api.host config option)

running the Vitest UI or Browser Mode on Windows

Details

The API handler for /__vitest_attachment__ uses the deprecated isFileServingAllowed incorrectly.
vitest/packages/ui/node/index.ts

Line 77 in eb1abf0
    <tbody>
if (!isFileServingAllowed(ctx.vite.config, fsPath)) {
The function expects the passed value to use cleanUrl after the check before file system related operation.
Because of this, it is possible to bypass the check by \\?\\..\\. This is not possible on Linux as Linux errors if a directory named ? does not exist.

A similar problem exists in other places as well.
vitest/packages/vitest/src/api/setup.ts

Lines 103 to 105 in eb1abf0
    <tbody>
    <tr class="border-0">
      <td id="L104" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="104"></td>
      <td id="LC104" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">   <span class="pl-k">return</span> <span class="pl-c1">undefined</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L105" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="105"></td>
      <td id="LC105" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line"> <span class="pl-kos">}</span> </td>
    </tr>
</tbody>
if (!isFileServingAllowed(testModule.project.vite.config, moduleId)) {
vitest/packages/vitest/src/api/setup.ts

Lines 119 to 121 in eb1abf0
    <tbody>
    <tr class="border-0">
      <td id="L120" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="120"></td>
      <td id="LC120" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">   <span class="pl-k">return</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L121" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="121"></td>
      <td id="LC121" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line"> <span class="pl-kos">}</span> </td>
    </tr>
</tbody>
if (!testModule || !isFileServingAllowed(project.vite.config, moduleId)) {
vitest/packages/browser/src/node/commands/fs.ts

Lines 10 to 11 in eb1abf0
    <tbody>
    <tr class="border-0">
      <td id="L11" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="11"></td>
      <td id="LC11" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line"> <span class="pl-c1">&amp;&amp;</span> <span class="pl-c1">!</span><span class="pl-en">isFileServingAllowed</span><span class="pl-kos">(</span><span class="pl-s1">path</span><span class="pl-kos">,</span> <span class="pl-s1">project</span><span class="pl-kos">.</span><span class="pl-c1">vitest</span><span class="pl-kos">.</span><span class="pl-c1">vite</span><span class="pl-kos">)</span> </td>
    </tr>
</tbody>
!isFileServingAllowed(path, project.vite)
vitest/packages/browser/src/node/plugin.ts

Lines 194 to 196 in eb1abf0
    <tbody>
    <tr class="border-0">
      <td id="L195" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="195"></td>
      <td id="LC195" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">   <span class="pl-k">return</span> <span class="pl-en">next</span><span class="pl-kos">(</span><span class="pl-kos">)</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L196" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="196"></td>
      <td id="LC196" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line"> <span class="pl-kos">}</span> </td>
    </tr>
</tbody>
if (!isFileServingAllowed(parentServer.vite.config, fsPath)) {
vitest/packages/browser/src/node/rpc.ts

Lines 115 to 121 in eb1abf0
    <tbody>
    <tr class="border-0">
      <td id="L116" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="116"></td>
      <td id="LC116" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">   <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-c1">!</span><span class="pl-en">isFileServingAllowed</span><span class="pl-kos">(</span><span class="pl-s1">path</span><span class="pl-kos">,</span> <span class="pl-s1">vite</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L117" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="117"></td>
      <td id="LC117" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">     <span class="pl-k">throw</span> <span class="pl-k">new</span> <span class="pl-v">Error</span><span class="pl-kos">(</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L118" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="118"></td>
      <td id="LC118" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">       <span class="pl-s">`Access denied to "<span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">path</span><span class="pl-kos">}</span></span>". See Vite config documentation for "server.fs": https://vitejs.dev/config/server-options.html#server-fs-strict.`</span><span class="pl-kos">,</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L119" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="119"></td>
      <td id="LC119" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">     <span class="pl-kos">)</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L120" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="120"></td>
      <td id="LC120" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line">   <span class="pl-kos">}</span> </td>
    </tr>

    <tr class="border-0">
      <td id="L121" class="blob-num border-0 tmp-px-3 py-0 color-bg-default" data-line-number="121"></td>
      <td id="LC121" class="blob-code border-0 tmp-px-3 py-0 color-bg-default blob-code-inner js-file-line"> <span class="pl-kos">}</span> </td>
    </tr>
</tbody>
function checkFileAccess(path: string) {
That said, this isFileServingAllowed check does not actually prevent the API to be abused. Since the API has rerun feature and file write feature, it's possible to run arbitrary script by writing a script as a test file using saveTestFile and running it using rerun. This means exposing the API / Vitest UI is equivalent to giving script execution access.
On the browser mode side, there're readFile / writeFile / saveSnapshotFile. So exposing the browser mode is equivalent to giving file read / write access.

PoC

Run Vitest UI

Get the API token by curl http://localhost:51204/__vitest__/

Run curl "http://localhost:51204/__vitest_attachment__?path=C:\\path\\to\\project\\?\\..\\..\\secret.txt&contentType=text/plain&token=$TOKEN" (TOKEN is the API token)

curl shows the content of secret.txt that is outside the project directory

Mitigations

Vitest now ships two configuration flags, allowWrite and allowExec, that gate the privileged operations exploited by this vulnerability. Both are disabled by default whenever the API server is bound to a non-localhost host, ensuring that exposing the server to the network no longer implicitly grants write or execute capabilities to remote clients.

When these flags are disabled, the UI also enters a read-only mode: in-browser code editing and test file execution are turned off, removing the attack surface that allowed remote code execution. Many Browser Mode features are also disabled, like attachments, artifacts or snapshots. See browser.api.

Users who require the full interactive UI on a networked host must explicitly opt in by setting allowWrite and/or allowExec to true.

Release Notes

4.1.7

More info than we can show here.

4.1.6

More info than we can show here.

4.1.5

More info than we can show here.

4.1.4

More info than we can show here.

4.1.3

More info than we can show here.

4.1.2

More info than we can show here.

4.1.1

More info than we can show here.

4.1.0

More info than we can show here.

4.0.18

More info than we can show here.

4.0.17

More info than we can show here.

4.0.16

More info than we can show here.

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

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          Update vitest to version 4.1.8

e07fff7

depfu Bot added the depfu label

sonarqubecloud Bot commented Jun 1, 2026

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

codecov Bot commented Jun 1, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

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