Use After Free Vulnerability in PostgreSQL pltcl Affects Multiple Versions
CVE-2026-116323

8.8HIGH

Key Information:

Vendor

PostgreSQL
Status
Postgresql
Vendor
CVE Published:
12 November 2026

What is CVE-2026-116323?

A use after free vulnerability found in PostgreSQL's pltcl allows an object creator to execute arbitrary code as the operating system user running the database. This occurs through a domain CHECK that enables re-entry into the Tcl interpreter, leading to the freeing or alteration of a string that is still referenced by the outer result conversion. Affected versions include PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24, highlighting the need for immediate updates to ensure database security.

Affected Version(s)

PostgreSQL 18 < 18.7

PostgreSQL 17 < 17.12

PostgreSQL 16 < 16.16

References

https://www.postgresql.org/support/security/CVE-2026-116323/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

The PostgreSQL project thanks Anthropic OSS program for reporting this problem.
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