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Debian LTS Advisory DLA-2759-1                [email protected]
https://www.debian.org/lts/security/                      Sylvain Beucler
September 17, 2021                            https://wiki.debian.org/LTS
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Package        : gnutls28
Version        : 3.5.8-5+deb9u6
Debian Bug     : 961889

GnuTLS, a portable cryptography library, fails to validate alternate
trust chains in some conditions.  In particular this breaks connecting
to servers that use Let's Encrypt certificates, starting 2021-10-01.

For Debian 9 stretch, this problem has been fixed in version

We recommend that you upgrade your gnutls28 packages.

For the detailed security status of gnutls28 please refer to
its security tracker page at:

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