CVE-2026-6473: PostgreSQL server undersizes allocations, via integer wraparound

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-08-25
Weakness: CWE-190

Description

Integer wraparound in multiple PostgreSQL server features allows an unprivileged database user to cause the server to undersize an allocation and write out-of-bounds. This may execute arbitrary code as the operating system user running the database. In applications that pass gigabyte-scale user inputs to the relevant database functions, the application input provider may achieve a segmentation fault. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Affected products

PostgreSQL: before 14.23; from 15.0 before 15.18; from 16.0 before 16.14; from 17.0 before 17.10; from 18.0 before 18.4 — fixed in 14.23, 15.18, 16.14, 17.10, 18.4

How to fix

Upgrade to a fixed version: PostgreSQL 14.23, 15.18, 16.14, 17.10. Check the vendor advisory for mitigations.

References

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