CVE-2026-16239

PostgreSQL type confusion in cursor CLOSE + DECLARE executes arbitrary code

At a glance

Severity: HIGH 8.8
EPSS: EPSS 0.68 % · percentile 52 (2026-10-27)
State: PUBLISHED
Published: 2026-08-13
Updated: 2026-08-29
Assigner: PostgreSQL
NVD status: Modified

Description

Type confusion in PostgreSQL "portal"/cursor lifecycle allows a user to execute arbitrary code as the operating system user running the database, via re-creation of a cursor or other portal with different types. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	PostgreSQL
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 (Secondary)

Weaknesses (CWE)

CWE-843

European references

ENISA EUVD · EUVD-2026-57849
GCVE · GCVE-0-2026-16239

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-1336 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-1024 — Multiples vulnérabilités dans PostgreSQL · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:* ≥ 14.0 < 14.24
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:* ≥ 15.0 < 15.19
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:* ≥ 16.0 < 16.15
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:* ≥ 17.0 < 17.11
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:* ≥ 18.0 < 18.5

Affected products

Product	Versions
PostgreSQL	affected 18 < 18.6 ; affected 17 < 17.11 ; affected 16 < 16.15 ; affected 15 < 15.19 ; affected 0 < 14.24

References

https://www.postgresql.org/support/security/CVE-2026-16239/

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD