Use-after-free in PostgreSQL - CVE-2026-116323
Published: November 12, 2026
Vulnerability identifier: #VU166113
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-116323
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code as the operating system user running the database.
The vulnerability exists due to use-after-free in PostgreSQL pltcl when a domain CHECK re-enters the Tcl interpreter and frees or changes a string still used by the outer result conversion. A remote user can create an object with a crafted domain CHECK that triggers this reentrant conversion to execute arbitrary code.
Affected software
PostgreSQL
How to mitigate CVE-2026-116323
Install security update from vendor's website.
PostgreSQL - addressed in versions 14.25, 15.20, 16.16, 17.12, 18.7