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CVE-2026-6475

PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice

HIGH
8.8
CVSS Score
Published: May 14, 2026 at 01:00 PM UTC
Updated: June 17, 2026 at 11:00 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

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.

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-2026-6475/

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-61

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