An openjdk-8 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities.

DLA 2634-1: openjdk-8 security update

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Debian LTS Advisory DLA-2634-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
April 23, 2021   https://wiki.debian.org/LTS
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Package : openjdk-8
Version : 8u292-b10-0+deb8u1
CVE ID : CVE-2021-2161 CVE-2021-2163

Several vulnerabilities have been discovered in the OpenJDK Java runtime,
resulting in bypass of sandbox restrictions.

For Debian 9 stretch, these problems have been fixed in version
8u292-b10-0+deb8u1.

We recommend that you upgrade your openjdk-8 packages.

For the detailed security status of openjdk-8 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/openjdk-8

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS