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CVE-2026-6475— PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice

CVSS 8.8 · High EPSS 0.05% · P14

Affected Version Matrix 5

VendorProductVersion RangeStatus
n/aPostgreSQL18< 18.4affected
17< 17.10affected
16< 16.14affected
15< 15.18affected
< 14.23affected
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I. Basic Information for CVE-2026-6475

Vulnerability Information
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Vulnerability Title
PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-61
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
-PostgreSQL 18 ~ 18.4 -

II. Public POCs for CVE-2026-6475

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III. Intelligence Information for CVE-2026-6475

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Same Patch Batch · n/a · 2026-05-14 · 16 CVEs total

CVE-2026-66378.8 HIGHPostgreSQL refint allows stack buffer overflow and SQL injection
CVE-2026-64778.8 HIGHPostgreSQL libpq lo_* functions let server superuser overwrite client stack memory
CVE-2026-64738.8 HIGHPostgreSQL server undersizes allocations, via integer wraparound
CVE-2026-64797.5 HIGHPostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion
CVE-2026-64767.2 HIGHPostgreSQL pg_createsubscriber allows SQL injection via subscription name
CVE-2026-64786.5 MEDIUMPostgreSQL discloses MD5-hashed passwords via covert timing channel
CVE-2026-64725.4 MEDIUMPostgreSQL CREATE TYPE does not check multirange schema CREATE privilege
CVE-2026-65754.3 MEDIUMPostgreSQL pg_restore_attribute_stats accepts values that cause query planning to read pas
CVE-2026-64744.3 MEDIUMPostgreSQL timeofday() can disclose portions of server memory
CVE-2026-66383.7 LOWPostgreSQL REFRESH PUBLICATION allows SQL injection via table name
CVE-2026-24710CFEngine Enterprise 3.21.8前等多个版本XSS漏洞
CVE-2026-24711CFEngine 权限控制缺陷
CVE-2026-24712CFEngine Enterprise 命令注入漏洞
CVE-2026-38740Foscam VD1<5.3敏感信息明文传输
CVE-2025-69443coleam00 Archon 0.1.0远程代码执行漏洞

IV. Related Vulnerabilities

Same product: PostgreSQL
Same vendor: n/a
Same weakness: CWE-61

V. Comments for CVE-2026-6475

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