Hi,

The following vulnerability was published for ruby-rack-session.

CVE-2026-39324[0]:
| Rack::Session is a session management implementation for Rack. From
| 2.0.0 to before 2.1.2, Rack::Session::Cookie incorrectly handles
| decryption failures when configured with secrets:. If cookie
| decryption fails, the implementation falls back to a default decoder
| instead of rejecting the cookie. This allows an unauthenticated
| attacker to supply a crafted session cookie that is accepted as
| valid session data without knowledge of any configured secret.
| Because this mechanism is used to load session state, an attacker
| can manipulate session contents and potentially gain unauthorized
| access. This vulnerability is fixed in 2.1.2.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-39324
https://www.cve.org/CVERecord?id=CVE-2026-39324
[1] https://github.com/rack/rack-session/security/advisories/GHSA-33qg-7wpp-89cq
[2] https://github.com/rack/rack-session/commit/f43638cb3a4d15c3ecaf59e67a04b47fda08eeac

Regards,
Salvatore

Dear maintainer,

I've prepared an NMU for ruby-rack-session (versioned as 2.1.1-0.2) and
uploaded it to DELAYED/7. Please feel free to tell me if I should cancel it.

cu
Adrian

We believe that the bug you reported is fixed in the latest version of
ruby-rack-session, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1133007@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Adrian Bunk <bunk@debian.org> (supplier of updated ruby-rack-session package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 02 May 2026 11:37:55 +0300
Source: ruby-rack-session
Architecture: source
Version: 2.1.1-0.2
Distribution: unstable
Urgency: medium
Maintainer: Debian Ruby Extras Maintainers <pkg-ruby-extras-maintainers@lists.alioth.debian.org>
Changed-By: Adrian Bunk <bunk@debian.org>
Closes: 1133007
Changes:
 ruby-rack-session (2.1.1-0.2) unstable; urgency=medium
 .
   * Non-maintainer upload.
   * CVE-2026-39324: decrypt failure falls back to accepting
     unencrypted cookies (Closes: #1133007)
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