The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server. 

The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server

rauchg

darrachequesne

engine.io

(Experimental) An ambiguous license classifier was found.

What is an ambiguous license classifier?

Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

What is bad text encoding?

Bad text encoding

Package version is not a valid semantic version (semver).

What is bad semver?

Bad semver

Package has dependencies with an invalid semantic version. This could be a sign of beta, low quality, or unmaintained dependencies.

What is bad dependency semver?

Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

What are bidirectional unicode control characters?

Bidirectional unicode control characters

This package has multiple bin scripts with the same name.  This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack

What is bin script confusion?

Bin script confusion

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

(Experimental) Copyleft license information was found

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

What is a critical CVE?

Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

What is a CVE?

High CVE

Uses debug, reflection and dynamic code execution features.

What is debug access?

Debug access

The maintainer of the package marked it as deprecated. This could indicate that a single version should not be used, or that the package is no longer maintained and any new vulnerabilities will not be fixed.

What is a deprecated package?

Deprecated

(Experimental) Contains a known deprecated SPDX license exception.

What is a deprecated SPDX exception?

Deprecated SPDX exception

(Experimental) License is deprecated which may have legal implications regarding the package's use.

What is a deprecated license?

Deprecated license

Package name is similar to other popular packages and may not be the package you want.

What is a typosquat?

Possible typosquat attack

Dynamic require can indicate the package is performing dangerous or unsafe dynamic code execution.

What is dynamic require?

Dynamic require

Package does not contain any code. It may be removed, is name squatting, or the result of a faulty package publish.

What is an empty package?

Empty package

Package accesses environment variables, which may be a sign of credential stuffing or data theft.

What is environment variable access?

Environment variable access

(Experimental) Something was found which is explicitly marked as unlicensed

Explicitly Unlicensed Item

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What are extraneous dependencies?

Name

Extraneous dependency

Contains a dependency which resolves to a file. This can obfuscate analysis and serves no useful purpose.

What are file dependencies?

File dependency

Accesses the file system, and could potentially read sensitive data.

What is filesystem access?

Filesystem access

Package has a dependency with a floating version range.  This can cause issues if the dependency publishes a new major version.

What are floating dependencies?

Floating dependency

Contains a dependency which resolves to a remote git URL. Dependencies fetched from git URLs are not immutable can be used to inject untrusted code or reduce the likelihood of a reproducible install.

What are git dependencies?

Git dependency

Contains a dependency which resolves to a GitHub URL. Dependencies fetched from GitHub specifiers are not immutable can be used to inject untrusted code or reduce the likelihood of a reproducible install.

What are GitHub dependencies?

GitHub dependency

AI has identified unusual behaviors that may pose a security risk.

What is an AI detected anomaly?

AI detected anomaly

AI has identified this package as malware. This is a strong signal that the package may be malicious.

What is AI detected malware?

AI detected potential malware

AI has determined that this package may contain potential security issues or vulnerabilities.

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AI detected security risk

Contains native code which could be a vector to obscure malicious code, and generally decrease the likelihood of reproducible or reliable installs.

What's wrong with native code?

Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

What are high entropy strings?

High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

What are unicode homoglyphs?

Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

What is an install script?

Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

What is an invalid manifest file?

Invalid manifest file

Source files contain invisible characters. This could indicate source obfuscation or a supply chain attack.

What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

What is a license change?

License change

(Experimental) Contains an SPDX license exception.

What is a license exception?

License exception

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What's wrong with long strings?

Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

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Major refactor

This package is malware. We have asked the package registry to remove it.

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Known malware

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Manifest confusion

Contains a medium severity Common Vulnerability and Exposure (CVE).

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Medium CVE

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What is a mild CVE?

Low CVE

This package contains minified code.  This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

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Minified code

(Experimental) A package's licensing information has fine-grained problems

Nonpermissive License

The package was published by an npm account that no longer exists.

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Non-existent author

A required dependency is not declared in package.json and may prevent the package from working.

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Missing dependency

(Experimental) Package does not have a license and consumption legal status is unknown.

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Missing license

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Missing package tarball

(Experimental) Package contains multiple licenses.

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Mixed license

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Modified license exception

(Experimental) Package contains a modified version of an SPDX license.  Please read carefully before using this code.

What is a modified license?

Modified license

What is network access?

Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

What is new author?

New author

Package does not specify a list of contributors or an author in package.json.

Why is contributor and author data important?

No contributors or author data

Package does not have a linked bug tracker in package.json.

Why are bug trackers important?

No bug tracker

(Experimental) License information could not be found

No License Found

Package does not have a README. This may indicate a failed publish or a low quality package.

Why are READMEs important?

No README

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Why are missing repositories important?

No repository

Package does not have any tests. This is a strong signal of a poorly maintained or low quality package.

What does no tests mean?

No tests

Package is not semver >=1. This means it is not stable and does not support ^ ranges.

What is wrong with semver < v1?

No v1

What is a missing website?

No website

(Experimental) Package has a non-FSF-approved license.

What is a non FSF license?

Non FSF license

(Experimental) Package has a non-OSI-approved license.

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Non OSI license

(Experimental) Package contains a non-standard license somewhere. Please read carefully before using.

What is a non SPDX license?

Non SPDX license

(Experimental) A license not known to be considered permissive was found

Non-permissive License

(Experimental) Package contains a legal notice. This could increase your exposure to legal risk when using this project.

		@@ -0,1 +1,23 @@
		## [5.2.1](https://github.com/socketio/engine.io/compare/5.2.0...5.2.1) (2022-01-11)

		:warning: This release contains an important security fix :warning:

		A malicious client could send a specially crafted HTTP request, triggering an uncaught exception and killing the Node.js process:

		> RangeError: Invalid WebSocket frame: RSV2 and RSV3 must be clear
		> at Receiver.getInfo (/.../node_modules/ws/lib/receiver.js:176:14)
		> at Receiver.startLoop (/.../node_modules/ws/lib/receiver.js:136:22)
		> at Receiver._write (/.../node_modules/ws/lib/receiver.js:83:10)
		> at writeOrBuffer (internal/streams/writable.js:358:12)

		This bug was introduced by [this commit](https://github.com/socketio/engine.io/commit/f3c291fa613a9d50c924d74293035737fdace4f2), included in `engine.io@4.0.0`, so previous releases are not impacted.

		Thanks to Marcus Wejderot from Mevisio for the responsible disclosure.

		### Bug Fixes

		* properly handle invalid data sent by a malicious websocket client ([66f889f](https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab))



		# [5.2.0](https://github.com/socketio/engine.io/compare/5.1.1...5.2.0) (2021-08-29)
		@@ -2,0 +24,0 @@

		@@ -457,5 +457,2 @@ const qs = require("querystring");
		} else {
		// transport error handling takes over
		websocket.removeListener("error", onUpgradeError);

		const closeConnection = (errorCode, errorContext) =>
		@@ -462,0 +459,0 @@ abortUpgrade(socket, errorCode, errorContext);

		{
		"name": "engine.io",
		"version": "5.2.0",
		"version": "5.2.1",
		"description": "The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server",
		@@ -5,0 +5,0 @@ "main": "lib/engine.io.js",

Improved metrics

Worsened metrics