CVE-2016-5423

Severity: high (CVSS 8.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 6.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-12-09 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Debian Linux: 8.0
PostgreSQL: through 9.1.22; 9.2, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5 (+39)

References

http://rhn.redhat.com/errata/RHSA-2016-1781.html
http://rhn.redhat.com/errata/RHSA-2016-1820.html
http://rhn.redhat.com/errata/RHSA-2016-1821.html
http://rhn.redhat.com/errata/RHSA-2016-2606.html
http://www.debian.org/security/2016/dsa-3646
http://www.securityfocus.com/bid/92433
http://www.securitytracker.com/id/1036617
https://access.redhat.com/errata/RHSA-2017:2425
https://bugzilla.redhat.com/show_bug.cgi?id=1364001
https://security.gentoo.org/glsa/201701-33
https://www.postgresql.org/about/news/1688/
https://www.postgresql.org/docs/current/static/release-9-1-23.html

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