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deps: Bump express from 4.22.2 to 5.2.1 - #1380

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deps: Bump express from 4.22.2 to 5.2.1#1380
matz3 merged 2 commits into
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@dependabot dependabot Bot commented on behalf of github May 11, 2026 •
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Bumps express from 4.22.2 to 5.2.1.

Release notes

Sourced from express's releases.

v5.2.1

What's Changed

[!IMPORTANT]
The prior release (5.2.0) included an erroneous breaking change related to the extended query parser. There is no actual security vulnerability associated with this behavior (CVE-2024-51999 has been rejected). The change has been fully reverted in this release.

Full Changelog: expressjs/express@v5.2.0...v5.2.1

v5.2.0

Important: Security

What's Changed

... (truncated)

Changelog

Sourced from express's changelog.

5.2.1 / 2025-12-01

  • Revert security fix for CVE-2024-51999 (GHSA-pj86-cfqh-vqx6)
    • The prior release (5.2.0) included an erroneous breaking change related to the extended query parser. There is no actual security vulnerability associated with this behavior (CVE-2024-51999 has been rejected). The change has been fully reverted in this release.

5.2.0 / 2025-12-01

  • Security fix for CVE-2024-51999 (GHSA-pj86-cfqh-vqx6)
  • deps: body-parser@^2.2.1
  • A deprecation warning was added when using res.redirect with undefined arguments, Express now emits a warning to help detect calls that pass undefined as the status or URL and make them easier to fix.

5.1.0 / 2025-03-31

  • Add support for Uint8Array in res.send()
  • Add support for ETag option in res.sendFile()
  • Add support for multiple links with the same rel in res.links()
  • Add funding field to package.json
  • perf: use loop for acceptParams
  • refactor: prefix built-in node module imports
  • deps: remove setprototypeof
  • deps: remove safe-buffer
  • deps: remove utils-merge
  • deps: remove methods
  • deps: remove depd
  • deps: debug@^4.4.0
  • deps: body-parser@^2.2.0
  • deps: router@^2.2.0
  • deps: content-type@^1.0.5
  • deps: finalhandler@^2.1.0
  • deps: qs@^6.14.0
  • deps: server-static@2.2.0
  • deps: type-is@2.0.1

5.0.1 / 2024-10-08

5.0.0 / 2024-09-10

  • remove:
    • path-is-absolute dependency - use path.isAbsolute instead
  • breaking:
    • res.status() accepts only integers, and input must be greater than 99 and less than 1000
      • will throw a RangeError: Invalid status code: ${code}. Status code must be greater than 99 and less than 1000. for inputs outside this range
      • will throw a TypeError: Invalid status code: ${code}. Status code must be an integer. for non integer inputs
    • deps: send@1.0.0

... (truncated)

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Automatic rebases have been disabled on this pull request as it has been open for over 30 days.

@dependabot dependabot Bot added dependencies Automated dependency update javascript Pull requests that update Javascript code labels May 11, 2026
@dependabot dependabot Bot changed the title deps: Bump express from 4.22.1 to 5.2.1 deps: Bump express from 4.22.2 to 5.2.1 May 26, 2026
@dependabot
dependabot Bot force-pushed the dependabot/npm_and_yarn/express-5.2.1 branch 2 times, most recently from 9b012c3 to 130a157 Compare June 1, 2026 09:30
@RandomByte
RandomByte requested review from a team and removed request for a team July 10, 2026 07:30
@d3xter666

d3xter666 commented Jul 13, 2026

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@dependabot recreate

@dependabot
dependabot Bot force-pushed the dependabot/npm_and_yarn/express-5.2.1 branch from 130a157 to ac57c6e Compare July 13, 2026 11:01
@dependabot
dependabot Bot requested a review from a team July 13, 2026 11:01
@d3xter666 d3xter666 added the blocked Pull requests that are blocked label Jul 13, 2026
@d3xter666

d3xter666 commented Jul 14, 2026

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@ui5/server itself is safe — all 212 tests pass, live app works fine.

The blocker is the custom middleware ecosystem.

Express v5 passes its full req/res prototype to every middleware mounted via app.use(). Any custom middleware using removed v4 APIs breaks silently at runtime — no compile errors, tests may still pass, but specific endpoints fail in production.

Top 3 Real-World Hits

Breaking pattern Affected middleware types
req.connection.remoteAddress Auth, logging, proxy middlewares
req.host → must use req.hostname Host-based routing
Nested query strings (req.query.filter.type) Filtering middlewares — default parser changed from qs to URLSearchParams

Other Silent Traps

  • Wildcard routes: /api/* must become /api/{*path}
  • res.send(200) removed → use res.sendStatus(200)
  • res.sendfile() removed → use res.sendFile()

Bottom Line

Safe to merge for the core server. Risky for downstream consumers — any project with custom middleware must audit for the three patterns above before upgrading.
Maybe, we can consider it for v5 and list all the breaking changes that will be introduced.

@matz3

matz3 commented Aug 18, 2026

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@dependabot recreate

@dependabot
dependabot Bot force-pushed the dependabot/npm_and_yarn/express-5.2.1 branch from ac57c6e to 9451016 Compare August 18, 2026 08:03
@matz3 matz3 removed the blocked Pull requests that are blocked label Aug 18, 2026
@matz3
matz3 force-pushed the dependabot/npm_and_yarn/express-5.2.1 branch from a09d430 to 38f71d8 Compare August 18, 2026 09:45
@matz3
matz3 requested review from a team and KlattG and removed request for a team August 18, 2026 10:01
@d3xter666

d3xter666 commented Aug 18, 2026

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I'm fine with the chage.
Maybe, we just need to update the title to:
deps!: Bump express from 4.22.2 to 5.2.1
OR
feat!: Update express to version 5

This way it will appear more correctly in the Change log as a breaking change

dependabot Bot and others added 2 commits August 18, 2026 13:48
@dependabot @matz3
deps!: Bump express from 4.22.2 to 5.2.1
1e9fb0f 
Bumps [express](https://github.com/expressjs/express) from 4.22.2 to 5.2.1.
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@v4.22.2...v5.2.1)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

BREAKING CHANGE: The internal Express server has been upgraded from
Express 4 to Express 5. Review your custom middleware against the
Express 5 migration guide (https://expressjs.com/en/guide/migrating-5/)
and adjust it if necessary.

Signed-off-by: dependabot[bot] <support@github.com>
@matz3
docs: Note Express 5 upgrade for custom middleware
ab9c711 
The internal server has been upgraded to Express 5. Add a hint to the
v5 migration guide linking to the Express 5 migration guide so users can
adjust custom middleware if needed, and reflect the current Express 5
version on the Custom Server Middleware page.

JIRA: CPOUI5FOUNDATION-1313
@matz3
matz3 force-pushed the dependabot/npm_and_yarn/express-5.2.1 branch from 38f71d8 to ab9c711 Compare August 18, 2026 11:51
@matz3

matz3 commented Aug 18, 2026

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@d3xter666 thanks, I missed that. I also added a short BREAKING CHANGE note to the version bump commit.

@matz3
matz3 merged commit aafa8bb into main Aug 18, 2026
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@matz3
matz3 deleted the dependabot/npm_and_yarn/express-5.2.1 branch August 18, 2026 12:42
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@d3xter666 d3xter666 d3xter666 approved these changes
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