GNU Arch (tla) is a revision control system suited for widely distributed development.
Multiple format string vulnerabilities and a heap overflow vulnerability were discovered in the code of the neon library (GLSA 200405-01 and 200405-13). Current versions of the tla package include their own version of this library.
When connected to a malicious WebDAV server, these vulnerabilities could allow execution of arbitrary code with the rights of the user running tla.
There is no known workaround at this time.
All users of tla should upgrade to the latest stable version:
# emerge sync
# emerge -pv ">=dev-util/tla-1.2-r2"
# emerge ">=dev-util/tla-1.2-r2"