In GNU tar before 1.35, mishandled extension attributes in a PAX archive can lead to an application crash in xheader.c.
https://git.savannah.gnu.org/cgit/tar.git/tree/src/xheader.c?h=release_1_34#n1723
https://git.savannah.gnu.org/cgit/tar.git/commit/?id=a339f05cd269013fa133d2f148d73f6f7d4247e4