Expat 2.4.4 released, includes security fixes

January 31, 2022

Submitted by Sebastian Pipping.

libexpat is a fast streaming XML parser. Alongside libxml2, Expat is one of the most widely used software libre XML parsers written in C, precisely C99. It is cross-platform and licensed under the MIT license.

Expat 2.4.4 has been released yesterday. Besides a memory leak bugfix to xmlwf and fixes to the build system, this release is about security fixes. There are 2 CVEs involved, both related to fixed-size integer math (integer overflow) near memory allocation, not unlike what we had with 2.4.3 before. Impact is denial of service, or more.

For more details, please check out the change log.

If you maintain Expat packaging or a bundled copy of Expat or a pinned version of Expat somewhere, please update to 2.4.4. Thank you!

Sebastian Pipping

This article first appeared at blog.hartwork.org.

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