[ GLSA 202511-07 ] librnp: Weak random number generation

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Gentoo Linux Security Advisory                           GLSA 202511-07
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                                           https://security.gentoo.org/
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 Severity: High
    Title: librnp: Weak random number generation
     Date: November 26, 2025
     Bugs: #966299
       ID: 202511-07

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Synopsis
========

librnp uses weak random number generation such that generated keys can
be easily cracked.

Background
==========

librnp is a high performance C++ OpenPGP library.

Affected packages
=================

Package          Vulnerable    Unaffected
---------------  ------------  ------------
dev-util/librnp  = 0.18.0      >= 0.18.1

Description
===========

The affected librnp version generated weak session keys for its public
key encryption (PKESK) mode.

Impact
======

Messages encrypted using the affected librnp version might be readable
by an attacker with just the public key.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All librnp users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-util/librnp-0.18.1"

If sensitive information was sent using e.g. Thunderbird (with
USE=system-librnp, the default), it should be considered potentially
viewable by an attacker.

References
==========

[ 1 ] CVE-2025-13470
      https://nvd.nist.gov/vuln/detail/CVE-2025-13470

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202511-07

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2025 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5
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