The remote Debian host is missing a security-related update.
Several vulnerabilities have been found in PostgreSQL-9.4, a SQL database system. - CVE-2015-5288 Josh Kupershmidt discovered a vulnerability in the crypt() function in the pgCrypto extension. Certain invalid salt arguments can cause the server to crash or to disclose a few bytes of server memory. - CVE-2015-5289 Oskari Saarenmaa discovered that json or jsonb input values constructed from arbitrary user input can crash the PostgreSQL server and cause a denial of service.
Upgrade the postgresql-9.4 packages. For the stable distribution (jessie), these problems have been fixed in version 9.4.5-0+deb8u1.