Red Hat Security Advisory 2019-2079-01 - X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Issues addressed include null pointer and out of bounds write vulnerabilities.
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Gentoo Linux Security Advisory 201811-1 - Multiple vulnerabilities have been found in X.Org X11 library, the worst of which could allow for remote code execution. Versions less than 1.6.6 are affected.
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Slackware Security Advisory - New libX11 packages are available for Slackware 14.0, 14.1, 14.2, and -current to fix security issues.
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