🛡️ CVE-2026-6637 on Debian — postgresql-13

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-6637 as tracked by Debian, for the package postgresql-13. The fix is available in version 13.23-0+deb11u4; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

DEBIAN-CVE-2026-6637 is classified as CWE-89: SQL Injection. Untrusted input is concatenated into an SQL statement, letting an attacker change the query and reach data the request should not return.

Affected software

DEBIAN-CVE-2026-6637 is recorded against 4 packages.

  • postgresql-13 (fixed in 13.23-0+deb11u4)
  • postgresql-15 (fixed in 15.18-0+deb12u1)
  • postgresql-17 (fixed in 17.10-0+deb13u1)
  • postgresql-18 (fixed in 18.4-1)

Timeline and source

Published on 14 May 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2026-6637 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-14
Updated 2026-08-11
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
postgresql-13 — 13.23-0+deb11u4
postgresql-15 — 15.18-0+deb12u1
postgresql-17 — 17.10-0+deb13u1
postgresql-18 — 18.4-1

Similar Threats

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