CVE-2026-6475— PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice
Quick assessment
Affected
n/a PostgreSQL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
PostgreSQL是PostgreSQL组织的一套自由的对象关系型数据库管理系统。该系统支持大部分SQL标准并且提供了许多其他特性，例如外键、触发器、视图等。 PostgreSQL 18.4之前版本、17.10之前版本、16.14之前版本、15.18之前版本和14.23之前版本存在安全漏洞，该漏洞源于pg_basebackup和pg_rewind中符号链接跟随，可能导致原始超级用户覆盖本地文件以劫持操作系统账户。
Possible ATT&CK Techniques 3 AI
T1053 · Scheduled Task/Job T1546 · Event Triggered Execution T1059 · Command and Scripting InterpreterAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n/a | PostgreSQL | 18< 18.4 |
affected |
17< 17.10 |
affected | ||
16< 16.14 |
affected | ||
15< 15.18 |
affected | ||
< 14.23 |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-6475
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser choice
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
PostgreSQL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostgreSQL是PostgreSQL组织的一套自由的对象关系型数据库管理系统。该系统支持大部分SQL标准并且提供了许多其他特性，例如外键、触发器、视图等。 PostgreSQL 18.4之前版本、17.10之前版本、16.14之前版本、15.18之前版本和14.23之前版本存在安全漏洞，该漏洞源于pg_basebackup和pg_rewind中符号链接跟随，可能导致原始超级用户覆盖本地文件以劫持操作系统账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | PostgreSQL | 18 ~ 18.4 | - |
|
II. Public POCs for CVE-2026-6475
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-6475
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-6475 (1)
Same Patch Batch · n/a · 2026-05-14 · 16 CVEs total
| CVE-2026-6473 | 8.8 HIGH | PostgreSQL server undersizes allocations, via integer wraparound |
| CVE-2026-6477 | 8.8 HIGH | PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory |
| CVE-2026-6637 | 8.8 HIGH | PostgreSQL refint allows stack buffer overflow and SQL injection |
| CVE-2026-6479 | 7.5 HIGH | PostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion |
| CVE-2026-6476 | 7.2 HIGH | PostgreSQL pg_createsubscriber allows SQL injection via subscription name |
| CVE-2026-6478 | 6.5 MEDIUM | PostgreSQL discloses MD5-hashed passwords via covert timing channel |
| CVE-2026-6472 | 5.4 MEDIUM | PostgreSQL CREATE TYPE does not check multirange schema CREATE privilege |
| CVE-2026-6474 | 4.3 MEDIUM | PostgreSQL timeofday() can disclose portions of server memory |
| CVE-2026-6575 | 4.3 MEDIUM | PostgreSQL pg_restore_attribute_stats accepts values that cause query planning to read pas |
| CVE-2026-6638 | 3.7 LOW | PostgreSQL REFRESH PUBLICATION allows SQL injection via table name |
| CVE-2026-24710 | Northern.tech CFEngine Enterprise 跨站脚本漏洞 | |
| CVE-2026-24711 | Northern.tech CFEngine Enterprise 安全漏洞 | |
| CVE-2026-24712 | Northern.tech CFEngine 安全漏洞 | |
| CVE-2026-38740 | Foscam VD1 Video Doorbell 安全漏洞 | |
| CVE-2025-69443 | Archon 安全漏洞 |
IV. Related Vulnerabilities
Same product: PostgreSQL
-
CVE-2026-14671
PostgreSQL refint plan cache type confusion executes arbitra -
CVE-2026-6471
PostgreSQL logical decoding can dlopen arbitrary file -
CVE-2026-6469
PostgreSQL ALTER TABLE ALTER TYPE resets extended statistics -
CVE-2026-6470
PostgreSQL fails to check type USAGE privilege -
CVE-2026-6464
PostgreSQL psql COPY FROM STDIN early failure processes data
Same vendor: n/a
-
CVE-2026-78187
Piwigo Public Authentication cross site scripting -
CVE-2026-78186
Open5GS HSS hss-cx-path.c assertion -
CVE-2026-78178
jQWidgets jqx-all.js jqxBaseFramework.extend prototype pollu -
CVE-2026-78158
Open5GS AMF UEContextReleaseRequest Path improper authorizat -
CVE-2026-78157
Open5GS Rx AA-Request pcrf-rx-path.c pcrf_rx_aar_cb out-of-b
Same weakness: CWE-61
-
CVE-2026-75038
Predictable temporary file in /tmp allows symlink attack in -
CVE-2026-64846
Nix: Arbitrary file truncation outside the sandbox with recu -
CVE-2026-32657
Dell AppSync 后置链接漏洞 -
CVE-2026-47766
crun follows rootfs /dev symlink while creating default devi -
CVE-2026-53802
rsync < 3.5.0 Arbitrary File Read via Symlink Following
V. Comments for CVE-2026-6475
No comments yet