Tails 4.0 fixes many security issues that affect Tails 3.16. You should upgrade to Tails 4.0 as soon as possible.

• Tor Browser: Mozilla Foundation Security Advisory 2019-33
• Linux: CVE-2019-15118, CVE-2019-15117, CVE-2019-16714, CVE-2019-14835, CVE-2019-15504, CVE-2019-14821, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816, CVE-2019-15505, and CVE-2019-15538
• CUPS CVE-2019-8696, CVE-2019-8675, and more security fixes
• GnuPG: mitigate the certificates flooding attack
• e2fsprogs Debian Security Advisory 4535
• ghostscript: Debian Security Advisory 4518, Debian Security Advisory 4499
• WebKitGTK: Debian Security Advisory 4515
• Pango: Debian Security Advisory 4496
• ffmpeg: Debian Security Advisory 4502
• expat: Debian Security Advisory 4530
• GLib: CVE-2019-13012
• libmariadb3: numerous vulnerabilities
• NSS: CVE-2019-11719, CVE-2019-11727, CVE-2019-11729).
• LibreOffice: Debian Security Advisory 4519, Debian Security Advisory 4501, Debian Security Advisory 4483, and CVE-2019-9848
• Samba: Debian Security Advisory 4513
• OpenSSL: Debian Security Advisory 4539
• libxslt: CVE-2019-11068, CVE-2019-13117, and CVE-2019-13118
• zeromq3: Debian Security Advisory 4477
• patch: Debian Security Advisory 4489
• Thunderbird: Debian Security Advisory 4523, Debian Security Advisory 4482
• wpasupplicant: Debian Security Advisory 4538
• IBus: Debian Security Advisory 4525
• sudo: Debian Security Advisory 4543