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🚨 [security] Update express 5.1.0 → 5.2.1 (minor) #654

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🚨 [security] Update express 5.1.0 → 5.2.1 (minor) #654

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@depfu depfu bot commented Dec 1, 2025

Welcome to Depfu 👋

This is one of the first three pull requests with dependency updates we've sent your way. We tried to start with a few easy patch-level updates. Hopefully your tests will pass and you can merge this pull request without too much risk. This should give you an idea how Depfu works in general.

After you merge your first pull request, we'll send you a few more. We'll never open more than seven PRs at the same time so you're not getting overwhelmed with updates.

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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 upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ express (5.1.0 → 5.2.1) · Repo · Changelog

Security Advisories 🚨

🚨 express improperly controls modification of query properties

Impact

when using the extended query parser in express ('query parser': 'extended'), the request.query object inherits all object prototype properties, but these properties can be overwritten by query string parameter keys that match the property names

Important

the extended query parser is the default in express 4; this was changed in express 5 which by default uses the simple query parser

Patches

the issue has been patched to ensure request.query is a plain object so request.query no longer has object prototype properties. this brings the default behavior of extended query parsing in line with express's default simple query parser

Workaround

this only impacts users using extended query parsing ('query parser': 'extended'), which is the default in express 4, but not express 5. all users are encouraged to upgrade to the patched versions, but can otherwise work around this issue:

provide qs directly and specify plainObjects: true 

app.set('query parser',
  function (str) {
    return qs.parse(str, {
      plainObjects: true
  });
});
Release Notes

5.2.0

Important: Security

What's Changed

New Contributors

Full Changelog: v5.1.0...v5.2.0

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

Commits

See the full diff on Github. The new version differs by 55 commits:

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@depfu depfu bot added the depfu label Dec 1, 2025
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sonarqubecloud bot commented Dec 1, 2025

Quality Gate Passed 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

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