CVE-2016-5423 Null dereference in n/a

What is CVE-2016-5423?

CVE-2016-5423 is a high-severity vulnerability in Debian Debian Linux, published on 9 Dec 2016. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

PostgreSQL before 9.1.23, 9.2.x before 9.2.18, 9.3.x before 9.3.14, 9.4.x before 9.4.9, and 9.5.x before 9.5.4 allow remote authenticated users to cause a denial of service (NULL pointer dereference and server crash), obtain sensitive memory information, or possibly execute arbitrary code via (1) a CASE expression within the test value subexpression of another CASE or (2) inlining of an SQL function that implements the equality operator used for a CASE expression involving values of different types.

Weakness: CWE-476

Which versions are affected by CVE-2016-5423?

It affects 2 products.

Products include Debian Debian Linux, Postgresql Postgresql.

How do I fix CVE-2016-5423?

Upgrade to a fixed version.

Is CVE-2016-5423 being exploited?

There is no known exploitation of CVE-2016-5423 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h824-5q6w-q27x, UBUNTU-CVE-2016-5423.