Debian Security Advisory

DLA-2751-1 postgresql-9.6 -- LTS security update

Date Reported:
31 Aug 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-3449.
More information:

PostgreSQL 9.6.23 fixes this security issue:

Disallow SSL renegotiation more completely (Michael Paquier)

SSL renegotiation has been disabled for some time, but the server would still cooperate with a client-initiated renegotiation request. A maliciously crafted renegotiation request could result in a server crash (see OpenSSL issue CVE-2021-3449). Disable the feature altogether on OpenSSL versions that permit doing so, which are 1.1.0h and newer.

For Debian 9 stretch, this problem has been fixed in version 9.6.23-0+deb9u1.

We recommend that you upgrade your postgresql-9.6 packages.

For the detailed security status of postgresql-9.6 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: