libarchive is a library for manipulating different streaming archive formats, including certain tar variants, several cpio formats, and both BSD and GNU ar variants.
Multiple vulnerabilities have been discovered in libarchive. Please review the CVE identifiers referenced below for details.
A remote attacker could entice a user to open a specially crafted archive file possibly resulting in the execution of arbitrary code with the privileges of the process or a Denial of Service condition.
There is no known workaround at this time.
All libarchive users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/libarchive-3.4.2"