CVE-2025-32441

NameCVE-2025-32441
DescriptionRack is a modular Ruby web server interface. Prior to version 2.2.14, when using the `Rack::Session::Pool` middleware, simultaneous rack requests can restore a deleted rack session, which allows the unauthenticated user to occupy that session. Rack session middleware prepares the session at the beginning of request, then saves is back to the store with possible changes applied by host rack application. This way the session becomes to be a subject of race conditions in general sense over concurrent rack requests. When using the `Rack::Session::Pool` middleware, and provided the attacker can acquire a session cookie (already a major issue), the session may be restored if the attacker can trigger a long running request (within that same session) adjacent to the user logging out, in order to retain illicit access even after a user has attempted to logout. Version 2.2.14 contains a patch for the issue. Some other mitigations are available. Either ensure the application invalidates sessions atomically by marking them as logged out e.g., using a `logged_out` flag, instead of deleting them, and check this flag on every request to prevent reuse; or implement a custom session store that tracks session invalidation timestamps and refuses to accept session data if the session was invalidated after the request began.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ruby-rack (PTS)bullseye2.1.4-3+deb11u2vulnerable
bullseye (security)2.1.4-3+deb11u3vulnerable
bookworm2.2.6.4-1+deb12u1vulnerable
bookworm (security)2.2.13-1~deb12u1vulnerable
sid, trixie3.1.12-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ruby-racksource(unstable)3.0.8-2

Notes

[bullseye] - ruby-rack <postponed> (Minor issue, prolonging already hihacked session)
https://github.com/rack/rack/security/advisories/GHSA-vpfw-47h7-xj4g
Fixed by: https://github.com/rack/rack/commit/c48e52f7c57e99e1e1bf54c8760d4f082cd1c89d (2.2.14)
Related code was moved to rack-session in 3.0.0.beta1 and thus mark 3.0.8-2 as the first
version in unstable addressing the issue. The ruby-rack-session issue has a own CVE (CVE-2025-46336)

Search for package or bug name: Reporting problems