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Node.js vulnerabilities directly affect Express. Therefore keep a watch on Node.js vulnerabilities and make sure you are using the latest stable version of Node.js.

The list below enumerates the Express vulnerabilities that were fixed in the specified version update.

NOTE: If you believe you have discovered a security vulnerability in Express, please see Security Policies and Procedures.

4.x

4.11.1
- Fixed root path disclosure vulnerability in express.static, res.sendfile, and res.sendFile
4.10.7
- Fixed open redirect vulnerability in express.static (advisory, CVE-2015-1164).
4.8.8
- Fixed directory traversal vulnerabilities in express.static (advisory , CVE-2014-6394).
4.8.4
- Node.js 0.10 can leak fds in certain situations that affect express.static and res.sendfile. Malicious requests could cause fds to leak and eventually lead to EMFILE errors and server unresponsiveness.
4.8.0
- Sparse arrays that have extremely high indexes in the query string could cause the process to run out of memory and crash the server.
- Extremely nested query string objects could cause the process to block and make the server unresponsive temporarily.

3.x

Express 3.x IS NO LONGER MAINTAINED

Known and unknown security issues in 3.x have not been addressed since the last update (1 August, 2015). Using the 3.x line should not be considered secure.

3.19.1
- Fixed root path disclosure vulnerability in express.static, res.sendfile, and res.sendFile
3.19.0
- Fixed open redirect vulnerability in express.static (advisory, CVE-2015-1164).
3.16.10
- Fixed directory traversal vulnerabilities in express.static.
3.16.6
- Node.js 0.10 can leak fds in certain situations that affect express.static and res.sendfile. Malicious requests could cause fds to leak and eventually lead to EMFILE errors and server unresponsiveness.
3.16.0
- Sparse arrays that have extremely high indexes in query string could cause the process to run out of memory and crash the server.
- Extremely nested query string objects could cause the process to block and make the server unresponsive temporarily.
3.3.0
- The 404 response of an unsupported method override attempt was susceptible to cross-site scripting attacks.