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Fencer Intel
high 8.8

CVE-2026-18447 json

PostgreSQL output parameter type confusion executes arbitrary code

published 2d ago modified 2d ago also EUVD-2026-124432

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Type confusion in PostgreSQL SQL-language functions allows an object creator to execute arbitrary code as the operating system user running the database, via an output parameter of type "any". Versions before PostgreSQL 18.7, 17.12, 16.16, 15.20, and 14.25 are affected.

Patch / fix

  • n/a PostgreSQL 14.25, 15.20, 16.16, 17.12, 18.7
  • postgresql-15 Debian 12 15.20-0+deb12u1
  • postgresql-17 Debian 13 17.12-0+deb13u1

debian advisories DEBIAN-CVE-2026-18447

  • postgresql14 openSUSE Tumbleweed 14.25-1.1
  • postgresql15 openSUSE Tumbleweed 15.20-1.1
  • postgresql16 openSUSE Tumbleweed 16.16-1.1
  • postgresql17 openSUSE Tumbleweed 17.12-1.1

opensuse advisories openSUSE-SU-2026:12550-1openSUSE-SU-2026:12551-1openSUSE-SU-2026:12552-1openSUSE-SU-2026:12553-1

  • postgresql15 Alpine 3.22, Alpine 3.21 15.20-r0
  • postgresql16 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 16.16-r0
  • postgresql17 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 17.12-r0
  • postgresql18 Alpine 3.24, Alpine 3.23 18.7-r0

alpine advisories ALPINE-CVE-2026-18447

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2026-18447 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18447 updated cvss 8.8

postgresql: postgresql: Arbitrary code execution via type confusion in SQL-language functions

  • Red Hat Hardened Images postgresql18 18.6-1.hum1, postgresql17 17.11-1.2.hum1
    affected: workaround, no fix available
  • Red Hat Hardened Images libpq 18.7-0.1.hum1
    fixed: vendor fix RHSA-2026:99821

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3d ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-14).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a PostgreSQL

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.