CVE-2025-12818

PostgreSQL libpq undersizes allocations, via integer wraparound

MEDIUM

5.9

CVSS Score

Published: November 13, 2025 at 01:00 PM UTC

Updated: October 19, 2026 at 01:10 PM UTC

1 product affected across 1 vendorPostgreSQL

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

Integer wraparound in multiple PostgreSQL libpq client library functions allows an application input provider or network peer to cause libpq to undersize an allocation and write out-of-bounds by hundreds of megabytes. This results in a segmentation fault for the application using libpq. Versions before PostgreSQL 18.1, 17.7, 16.11, 15.15, 14.20, and 13.23 are affected.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PostgreSQL · PostgreSQL

90%

0 ≤ v < 13.2314 ≤ v < 14.2015 ≤ v < 15.1516 ≤ v < 16.1117 ≤ v < 17.718 ≤ v < 18.1014 15 16 17 18

Affected range stops below 13.23, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.20, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://www.postgresql.org/support/security/CVE-2025-12818/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMPostgreSQL

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-190

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