The security update released in DSA-2850-1 for libyaml introduced a regression in libyaml failing to parse a subset of valid yaml documents. For reference the original advisory text follows.

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Debian Security Advisory DSA-2850-2                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                      Salvatore Bonaccorso
February 12, 2014                      http://www.debian.org/security/faq
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Package        : libyaml
Vulnerability  : regression
Debian Bug     : 738587

The security update released in DSA-2850-1 for libyaml introduced a
regression in libyaml failing to parse a subset of valid yaml documents.
For reference the original advisory text follows.

Florian Weimer of the Red Hat Product Security Team discovered a
heap-based buffer overflow flaw in LibYAML, a fast YAML 1.1 parser and
emitter library. A remote attacker could provide a YAML document with a
specially-crafted tag that, when parsed by an application using libyaml,
would cause the application to crash or, potentially, execute arbitrary
code with the privileges of the user running the application.

For the oldstable distribution (squeeze), this problem has been fixed in
version 0.1.3-1+deb6u3.

For the stable distribution (wheezy), this problem has been fixed in
version 0.1.4-2+deb7u3.

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

We recommend that you upgrade your libyaml 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/

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