A bouncycastle security update has been released for Debian GNU/Linux 9 LTS to address an issue in the bouncycastle crypto library where attackers could obtain sensitive information due to observable differences in its response to invalid input.

DLA 2433-1: bouncycastle security update

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Debian LTS Advisory DLA-2433-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
November 05, 2020   https://wiki.debian.org/LTS
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Package : bouncycastle
Version : 1.56-1+deb9u3
CVE ID : CVE-2020-26939

It was discovered that there was an issue in the bouncycastle crypto
library where attackers could obtain sensitive information due to
observable differences in its response to invalid input.

For Debian 9 "Stretch", this problem has been fixed in version
1.56-1+deb9u3.

We recommend that you upgrade your bouncycastle packages.

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

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