DescriptionExpress.js minimalist web framework for node. Versions of Express.js prior to 4.19.0 and all pre-release alpha and beta versions of 5.0 are affected by an open redirect vulnerability using malformed URLs. When a user of Express performs a redirect using a user-provided URL Express performs an encode [using `encodeurl`]( on the contents before passing it to the `location` header. This can cause malformed URLs to be evaluated in unexpected ways by common redirect allow list implementations in Express applications, leading to an Open Redirect via bypass of a properly implemented allow list. The main method impacted is `res.location()` but this is also called from within `res.redirect()`. The vulnerability is fixed in 4.19.2 and 5.0.0-beta.3.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1068346

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
node-express (PTS)buster4.16.4-1vulnerable
sid, trixie4.19.2+~cs8.36.21-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - node-express <no-dsa> (Minor issue)
[bullseye] - node-express <no-dsa> (Minor issue)
[buster] - node-express <postponed> (Minor issue; can be fixed in next update) (4.19.0) (4.19.2)

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