An openjdk-8 security update has been released for Debian GNU/Linux 9.

DSA 4668-1: openjdk-8 security update

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Debian Security Advisory DSA-4668-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 28, 2020   https://www.debian.org/security/faq
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Package : openjdk-8
CVE ID : CVE-2020-2754 CVE-2020-2755 CVE-2020-2756 CVE-2020-2757
CVE-2020-2773 CVE-2020-2781 CVE-2020-2800 CVE-2020-2803
CVE-2020-2805

Several vulnerabilities have been discovered in the OpenJDK Java runtime,
resulting in denial of service, insecure TLS handshakes, bypass of
sandbox restrictions or HTTP response splitting attacks.

For the oldstable distribution (stretch), these problems have been fixed
in version 8u252-b09-1~deb9u1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/