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docs: document trusted host environment in SECURITY.md by OrKoN · Pull Request #3125 · ChromeDevTools/chrome-devtools-mcp · GitHub
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docs: document trusted host environment in SECURITY.md - #3125

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@OrKoN OrKoN commented Oct 14, 2026

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Adds a "Trusted host environment" section to SECURITY.md clarifying that chrome-devtools-mcp is a local developer tool that trusts the environment it is started in, in the same way that npm, npx, node, or git do.

Specifically, the following are documented as trusted inputs:

  • The current working directory and its contents.
  • Environment variables (PATH, npm_config_*, proxy settings).
  • The user's npm configuration at every scope and the npm executable it resolves to. We intentionally shell out to npm for update checks so the user's registry, proxy, and authentication configuration is respected.
  • The Node.js installation and the Chrome binary.

Reports that require an attacker to control any of these (for example, placing npm.cmd or .npmrc in a workspace the server is later started from) are out of scope. The section also points users to OS-level sandboxing for untrusted repositories and to CHROME_DEVTOOLS_MCP_NO_UPDATE_CHECKS for disabling the update check.

Clarify that the server trusts the environment it is started in (working
directory, environment variables, npm configuration and executable, Node
and Chrome), in the same way that npm, npx, node, or git do. We
intentionally shell out to npm for update checks so that the user's
registry, proxy, and authentication configuration is respected. Reports
that require an attacker to control the workspace the server is started
in are therefore out of scope.
@OrKoN
OrKoN requested a review from mathiasbynens October 14, 2026 11:00
@OrKoN
OrKoN added this pull request to the merge queue Oct 14, 2026
Merged via the queue into main with commit 1352207 Oct 14, 2026
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@OrKoN
OrKoN deleted the docs/security-trusted-host-environment branch October 14, 2026 11:51
OrKoN added a commit that referenced this pull request Oct 15, 2026
🤖 I have created a release *beep* *boop*
---


##
[1.11.0](chrome-devtools-mcp-v1.10.1...chrome-devtools-mcp-v1.11.0)
(2026-10-15)


### 🎉 Features

* add --file-navigations flag to reject file: URL navigations
([#2853](#2853))
([54cae57](54cae57))
* Add analyze_heapsnapshot_contexts MCP tool
([#2791](#2791))
([190aeee](190aeee))
* add ignoreCache option to performance_start_trace
([#2931](#2931))
([3467d40](3467d40))
* add maxNameLength truncation option to compare_heapsnapshots
([#3098](#3098))
([1e1c53e](1e1c53e))
* Add pagination to compare_heapsnapshots
([#3140](#3140))
([daebfd1](daebfd1))
* **config:** add ConfigWatcher to watch config file changes
([#3139](#3139))
([9171f77](9171f77))
* discover the config file in predefined locations
([#2876](#2876))
([02c0112](02c0112))
* implement ffmpeg-free screencast tools enabled by default
([#3123](#3123))
([8953ea5](8953ea5))
* reduce StaticText noise in text snapshots
([#2895](#2895))
([4441325](4441325))
* report pages opened by input actions
([#2679](#2679))
([28fb230](28fb230))
* resolve config defaults after merging CLI and config file
([#2849](#2849))
([bdeb70d](bdeb70d))
* return failing audits and DOM nodes inline from lighthouse_audit
([#2930](#2930))
([241fba5](241fba5))
* skip more redundant data in text snapshots
([#2896](#2896))
([b2f522c](b2f522c))
* support debugging WebMCP tools in third-party developer tools
([#2900](#2900))
([0db519f](0db519f))
* support emulating additional CSS media features
([#2929](#2929))
([69524f0](69524f0))
* support evaluating scripts from local files
([#2606](#2606))
([9cf47a4](9cf47a4))
* Support truncation in get_heapsnapshot_details
([#3137](#3137))
([f827e06](f827e06))
* Truncate long names by default to 100 characters
([#2893](#2893))
([5ddb0a3](5ddb0a3))


### 🛠️ Fixes

* account for scroll offsets in downscaled screenshots
([#2685](#2685))
([830c693](830c693))
* allow --categoryExtensions when connecting to an existing browser
([#3041](#3041))
([d250bc5](d250bc5))
* allow stopping the CLI if command fails
([#3088](#3088))
([77e238e](77e238e)),
closes
[#2982](#2982)
* avoid runtime title fetches
([#2883](#2883))
([04195d1](04195d1))
* better config support for chrome-devtools CLI
([#2819](#2819))
([9624e64](9624e64))
* clamp async stack trace separator repeat count
([#3035](#3035))
([93e06ab](93e06ab)),
closes
[#3031](#3031)
* **cli:** pass positional values starting with `-` through to tools
([#3084](#3084))
([9de05ae](9de05ae)),
closes
[#2984](#2984)
* **collectors:** ignore transient target errors when subscribing to
service workers
([#2888](#2888))
([551dd6c](551dd6c))
* **daemon:** bound browser shutdown and avoid watchFile timeout on stop
([#2887](#2887))
([f3db5e7](f3db5e7))
* **daemon:** keep fallback socket in private runtime dir
([#2766](#2766))
([871a37e](871a37e))
* **daemon:** verify process identity before treating PID file as active
([#3109](#3109))
([b608bed](b608bed))
* do not close a healthy browser when a tool call outlasts 60s
([#3149](#3149))
([39c7db1](39c7db1))
* ensure aggregate IDs in heap snapshots are deterministic
([#2923](#2923))
([e918c47](e918c47))
* escape client-supplied values in McpContext logs and errors
([#2832](#2832))
([efb0d02](efb0d02)),
closes
[#2831](#2831)
* fail fast on tool calls stuck after a dead browser connection
([#2699](#2699))
([2a7ef50](2a7ef50))
* harden third-party tool result serialization
([#2892](#2892))
([4418a7b](4418a7b))
* honor explicit --allowUnrestrictedPaths=false in CLI mode
([#3040](#3040))
([61fc362](61fc362))
* include errors in slim responses
([#3085](#3085))
([ee38097](ee38097))
* **input:** reject multiple file paths on single-file input in
upload_file
([#2995](#2995))
([#3135](#3135))
([e650843](e650843))
* list fresh page titles
([#3103](#3103))
([e717082](e717082))
* **memory:** reject contradictory pagination options in
take_heapsnapshot
([#3002](#3002))
([#3131](#3131))
([508126c](508126c))
* **network:** enforce URL policy across redirects
([#2767](#2767))
([274cd4c](274cd4c))
* pass categoryExtensions to the target filter when connecting
([#3047](#3047))
([4e90238](4e90238))
* **performance:** report an error when performance_stop_trace is called
with no active trace
([#3001](#3001))
([#3126](#3126))
([e170384](e170384))
* preserve HeapSnapshotManager across browser reconnects
([#3025](#3025))
([64388c6](64388c6))
* propagate failed responseFilePath write error instead of reporting
body unavailable
([#2957](#2957))
([#3119](#3119))
([3cee3bd](3cee3bd))
* **pwa:** wait for initial navigation on launch and retry transient
install error
([#2889](#2889))
([63010cb](63010cb))
* record screencast at the page's device pixel size
([#3155](#3155))
([62e2aa4](62e2aa4))
* reject --blockedUrlPattern/--allowedUrlPattern hostname regexp groups
([#2796](#2796))
([ae0aaef](ae0aaef))
* reject JSON arrays as 3p and WebMCP tool params
([#2785](#2785))
([c14e616](c14e616))
* reject named groups in URL patterns
([#2857](#2857))
([5b2c6f9](5b2c6f9))
* reject non-positive --viewport dimensions
([#2781](#2781))
([0ef528a](0ef528a))
* reject non-positive resize_page dimensions
([#2784](#2784))
([6ab6d35](6ab6d35))
* reject unrestricted paths with an explicit workspace
([#2858](#2858))
([45c1c6c](45c1c6c))
* report unknown page id before last-page guard in close_page
([#3042](#3042))
([bdc7e24](bdc7e24))
* round lighthouse category scores and show unscored categories as n/a
([#2924](#2924))
([7007680](7007680)),
closes
[#2915](#2915)
[#2916](#2916)
* set empty filePath to undefined instead of empty string
([#2836](#2836))
([adfc1ff](adfc1ff)),
closes
[#2825](#2825)
* surface WebMCP tool exceptions in execute_webmcp_tool
([#3107](#3107))
([d80d22e](d80d22e)),
closes
[#2975](#2975)
* url pattern partial ipv4
([#2859](#2859))
([c87d190](c87d190))


### 📄 Documentation

* clarify Antigravity MCP setup for VS Code extension
([#2855](#2855))
([12e13ca](12e13ca))
* clarify scope of --no-javascript-evaluation
([#3100](#3100))
([0c67cd5](0c67cd5))
* correct link to configuration
([#3086](#3086))
([bbb1e36](bbb1e36))
* document trusted host environment in SECURITY.md
([#3125](#3125))
([1352207](1352207))
* fix inaccurate examples in skills and CLI docs
([#2922](#2922))
([ec372b0](ec372b0)),
closes
[#2906](#2906)
[#2907](#2907)
[#2908](#2908)
[#2910](#2910)
[#2912](#2912)
[#2913](#2913)
[#2918](#2918)
[#2919](#2919)
[#2920](#2920)
[#2921](#2921)
* fix some reported issues
([#3099](#3099))
([d5d2f08](d5d2f08))
* include serviceWorkerId parameter for evaluate_script
([#3015](#3015))
([#3129](#3129))
([0623434](0623434))
* mention heapsnapshot being cached between runs
([#3045](#3045))
([f08dbe1](f08dbe1)),
closes
[#2976](#2976)
* **skills:** remove invalid outputDir flag from lighthouse_audit calls
([#3013](#3013))
([#3130](#3130))
([7754226](7754226))
* update documentation and SKILL for get_css_styles tool
([#2824](#2824))
([3c12a91](3c12a91))


### ⚡ Performance

* **cli:** re-use MCPServer.from helpers for daemon
([#2804](#2804))
([89eb3d5](89eb3d5))
* Load heap snapshots in parallel in compare_heapsnapshots
([#3023](#3023))
([20c1391](20c1391))


### 🏗️ Refactor

* centralize config defaults and conflict checks
([#2753](#2753))
([a739ba8](a739ba8))
* create all tools and register per slim mode
([#2874](#2874))
([99847a7](99847a7))
* enable categories by default
([#2811](#2811))
([e33ee48](e33ee48))
* extract CLI examples and conflict list in mcp-options
([#2848](#2848))
([45000d9](45000d9))
* extract config parsing logic in a class
([#2861](#2861))
([e4168d0](e4168d0))
* extract worker logic into McpWorker
([#2800](#2800))
([77165c6](77165c6))
* group Puppeteer and tool options
([#2875](#2875))
([699c4d5](699c4d5))
* lazily initialize McpPage from Target and enumerate targets in
McpContext
([#2812](#2812))
([545cbe3](545cbe3))
* use default Error for toolSchema
([#2822](#2822))
([8b2768d](8b2768d))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: Alex Rudenko <OrKoN@users.noreply.github.com>
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