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CVE-2026-6637

PostgreSQL refint allows stack buffer overflow and SQL injection

HIGH
8.8
CVSS Score
Published: May 14, 2026 at 01:00 PM UTC
Updated: June 17, 2026 at 11:01 AM UTC
1 product affected across 1 vendorPostgreSQL

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Affected

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

PostgreSQL· PostgreSQL
95%
v < 14.2315 ≤ v < 15.1815.0 ≤ v < 15.1816 ≤ v < 16.1416.0 ≤ v < 16.1417 ≤ v < 17.1017.0 ≤ v < 17.1018 ≤ v < 18.418.0 ≤ v < 18.415161718
Affected range stops below 14.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

PatchVendor Advisory
Source: cverecord
https://www.postgresql.org/support/security/CVE-2026-6637/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.8HIGHPostgreSQL
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-89

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