Vulnerability Report

CVE-2026-6475

Title: Symlink following in pg_basebackup and pg_rewind

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-6475.

CWE Category CWE-61

Published Date May 14, 2026

Modified Date May 18, 2026

Exploit Status Not Found

Score 8.8 CVSS v3.1

Exploit Probability (EPSS)

0.32%

Vulnerability Summary

CVE-2026-6475: Symlink following in PostgreSQL pg_basebackup plain format and in pg_rewind allows an origin superuser to overwrite local files, e.g. /var/lib/postgres/.bashrc, that hijack the operating system account. It will remain the case that starting the server after these commands implicitly trusts the origin superuser, due to features like shared_preload_libraries. Hence, the attack has practical implications only if one takes relevant action between these commands and server start, like moving the files to a different VM or snapshotting the VM. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Impacted Vendors

postgresql 1

anynines 1

Reference Links

https://www.postgresql.org/support/security/CVE-2026-6475/

CVSS v3.1

Source Entity f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

Severity HIGH

8.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-6475 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 18, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.