CVE-2026-116306 PUBLISHED

PostgreSQL composite-type change during field assignment executes arbitrary code

Assigner: PostgreSQL
Reserved: 26.10.2026 Published: 12.11.2026 Updated: 12.11.2026

Type confusion in PostgreSQL composite-value field assignment allows an object creator to execute arbitrary code as the operating system user running the database, via changing a composite type between deforming and reforming a value. Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	n/a
Product	PostgreSQL
Versions	Default: unaffected affected from 18 to 18.7 (excl.) affected from 17 to 17.12 (excl.) affected from 16 to 16.16 (excl.) affected from 15 to 15.20 (excl.) affected from 0 to 14.25 (excl.)

Affected Configurations

attacker has permission to create objects (temporary objects or non-temporary objects in at least one schema)

Credits

The PostgreSQL project thanks OpenAI Codex Security, Bronson Yen, and Mehmet D. INCE for reporting this problem.

References

https://www.postgresql.org/support/security/CVE-2026-116306/

Problem Types

Access of Resource Using Incompatible Type ('Type Confusion') CWE