The fix Ubuntu applied to address the Ghostscript vulnerability identified in CVE-2018-16510 appears to be insufficient.
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Gentoo Linux Security Advisory 201811-12 - Multiple vulnerabilities have been found in GPL Ghostscript, the worst of which could result in the execution of arbitrary code. Versions prior to 9.26 are affected.
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Ubuntu Security Notice 3773-1 - It was discovered that Ghostscript contained multiple security issues. If a user or automated system were tricked into processing a specially crafted file, a remote attacker could possibly use these issues to access arbitrary files, execute arbitrary code, or cause a denial of service.
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