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

Posted on 26 November 2025
Gentoo-announce

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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
security@gentoo.org 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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