A libpng security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2439-1 security@debian.org
http://www.debian.org/security/ Moritz Muehlenhoff
March 22, 2012 http://www.debian.org/security/faq
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Package : libpng
Vulnerability : buffer overflow
Problem type : remote
Debian-specific: no
CVE ID : CVE-2011-3045

Glenn-Randers Pehrson discovered an buffer overflow in the libpng PNG
library, which could lead to the execution of arbitrary code if a
malformed image is processed.

For the stable distribution (squeeze), this problem has been fixed in
version 1.2.44-1+squeeze3. Packages for i386 are not yet available,
but will be provided shortly.

For the unstable distribution (sid), this problem will be fixed soon.

We recommend that you upgrade your libpng packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/