Rack 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.

The remote SUSE Linux SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01586-2 advisory.

    - CVE-2025-46727: possible memory exhaustion due to unbounded parameter parsing in Rack::QueryParser     (bsc#1242894).
    - CVE-2025-32441: deleted sessions can be restored and occupied by unauthenticated users when the     Rack::Session::Pool       middleware is being used (bsc#1242899).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01586-1 advisory.

    - CVE-2025-46727: possible memory exhaustion due to unbounded parameter parsing in Rack::QueryParser     (bsc#1242894).
    - CVE-2025-32441: deleted sessions can be restored and occupied by unauthenticated users when the     Rack::Session::Pool       middleware is being used (bsc#1242899).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7507-1 advisory.

    It was discovered that Rack incorrectly handled deleted rack sessions. An attacker could possibly use this     issue to expose sensitive information or to gain unauthorized access to user accounts. (CVE-2025-32441)

    It was discovered that Rack incorrectly limited the number of parameters in a web request. An attacker     could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS,     Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-46727)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
237782	SUSE SLES15 Security Update : rubygem-rack (SUSE-SU-2025:01586-2)	Nessus	SuSE Local Security Checks	medium
237086	SUSE SLES15 / openSUSE 15 Security Update : rubygem-rack (SUSE-SU-2025:01586-1)	Nessus	SuSE Local Security Checks	medium
236870	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : Rack vulnerabilities (USN-7507-1)	Nessus	Ubuntu Local Security Checks	medium

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CVE-2025-32441

medium

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medium

medium