A new security update has been released for Gentoo Linux - Perl: Execution of arbitrary code. Here the announcement:
"Gentoo Linux Security Advisory GLSA 200805-17
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http://security.gentoo.org/
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Severity: Normal
Title: Perl: Execution of arbitrary code
Date: May 20, 2008
Bugs: #219203
ID: 200805-17

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Synopsis
========

A double free vulnerability was discovered in Perl, possibly resulting
in the execution of arbitrary code and a Denial of Service.

Background
==========

Perl is a stable, cross platform programming language.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-lang/perl < 5.8.8-r5 >= 5.8.8-r5
2 sys-devel/libperl < 5.8.8-r2 >= 5.8.8-r2
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------

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

Tavis Ormandy and Will Drewry of the Google Security Team have reported
a double free vulnerability when processing a crafted regular
expression containing UTF-8 characters.

Impact
======

A remote attacker could possibly exploit this vulnerability to execute
arbitrary code or cause a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Perl users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/perl-5.8.8-r5"

All libperl users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-devel/libperl-5.8.8-r2"

References
==========

[ 1 ] CVE-2008-1927
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1927

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

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

http://security.gentoo.org/glsa/glsa-200805-17.xml

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
http://bugs.gentoo.org.

License
=======

Copyright 2008 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.

http://creativecommons.org/licenses/by-sa/2.5
"


GLSA 200805-14 Common Data Format library: User-assisted execution of arbitrary code
GLSA 200805-15 libid3tag: Denial of Service