Multiple use-after-free vulnerabilities in libxml2 2.5.10, 2.6.16, 2.6.26,
2.6.27, and 2.6.32, and libxml 1.8.17, allow context-dependent attackers to
cause a denial of service (application crash) via crafted (1) Notation or
(2) Enumeration attribute types in an XML file, as demonstrated by the
Codenomicon XML fuzzing framework.

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