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CVE-2026-6475· NVD / CVE Program· CNA PostgreSQL

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

Noroxi assessment

Priority: Monitor (action score 35/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: n/a PostgreSQL 14.23, 15.18, 16.14; azl3 postgresql 16.12-1 on Azure Linux 3.0 16.14-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to n/a PostgreSQL 14.23, 15.18, 16.14; azl3 postgresql 16.12-1 on Azure Linux 3.0 16.14-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.8 · v3.1—Proof of concept Fix available
Published
May 14, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · PostgreSQL
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
postgresqlpostgresql

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When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or gets exploit code

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  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • postgresql postgresqlbefore 14.23
  • postgresql postgresql15.0 and later · before 15.18
  • postgresql postgresql16.0 and later · before 16.14
  • postgresql postgresql17.0 and later · before 17.10
  • postgresql postgresql18.0 and later · before 18.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (PostgreSQL). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a PostgreSQL

    • 18 and later · before 18.4affected · rpm
    • 17 and later · before 17.10affected · rpm
    • 16 and later · before 16.14affected · rpm
    • 15 and later · before 15.18affected · rpm
    • before 14.23affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10postgresqlbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-contribbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-docsbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-plperlbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-plpython3before 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-pltclbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-private-develbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-private-libsbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-serverbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-server-develbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-staticbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-testbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-test-rpm-macrosbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-upgradebefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql-upgrade-develbefore 16.14-1.el10_216.14-1.el10_2
AlmaLinux:10postgresql18before 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-contribbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-docsbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-plperlbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-plpython3before 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-private-develbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-private-libsbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-serverbefore 18.4-1.el10_218.4-1.el10_2
AlmaLinux:10postgresql18-server-develbefore 18.4-1.el10_218.4-1.el10_2

+96

Same product

postgresql: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-7546PostgreSQL versions before 9.2.22, 9.3.18, 9.4.13, 9.5.8 and 9.6.4 are vulnerable to incorrect authentication flaw allowing remote attackers
    57Plan
  • CVE-2019-9193In PostgreSQL 9.3 through 11.2, the "COPY TO/FROM PROGRAM" function allows superusers and users in the 'pg_execute_server_program' group to
    55Plan
  • CVE-2020-25695A flaw was found in PostgreSQL versions before 13.1, before 12.5, before 11.10, before 10.15, before 9.6.20 and before 9.5.24.
    49Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-6473May 14, 2026 · PostgreSQL server undersizes allocations, via integer wraparound
    35Monitor
  • ← EarlierCVE-2026-6474May 14, 2026 · PostgreSQL timeofday() can disclose portions of server memory
    17Monitor
  • Later →CVE-2026-6476May 14, 2026 · PostgreSQL pg_createsubscriber allows SQL injection via subscription name
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
n/a PostgreSQL14.23Vendor (CNA)
n/a PostgreSQL15.18Vendor (CNA)
n/a PostgreSQL16.14Vendor (CNA)
n/a PostgreSQL17.10Vendor (CNA)
n/a PostgreSQL18.4Vendor (CNA)
azl3 postgresql 16.12-1 on Azure Linux 3.016.14-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:pg_repack1.5.1-1.module_el9.6.0+146+c54fdeca · AlmaLinux:9Package registry (OSV)
almalinux:pgaudit16.0-1.module_el9.4.0+66+eb9878bc · AlmaLinux:9Package registry (OSV)
almalinux:pgvector0.6.2-2.module_el9.6.0+167+4e561146 · AlmaLinux:9Package registry (OSV)
almalinux:postgis3.5.3-5.module_el9.8.0+236+2d3cbd4c · AlmaLinux:9Package registry (OSV)
almalinux:postgis-client3.5.3-5.module_el9.8.0+236+2d3cbd4c · AlmaLinux:9Package registry (OSV)
almalinux:postgis-docs3.5.3-5.module_el9.8.0+236+2d3cbd4c · AlmaLinux:9Package registry (OSV)
almalinux:postgis-upgrade3.5.3-5.module_el9.8.0+236+2d3cbd4c · AlmaLinux:9Package registry (OSV)
almalinux:postgis-utils3.5.3-5.module_el9.8.0+236+2d3cbd4c · AlmaLinux:9Package registry (OSV)
almalinux:postgres-decoderbufs2.4.0-1.Final.module_el9.4.0+66+eb9878bc · AlmaLinux:9Package registry (OSV)
almalinux:postgresql16.14-1.module_el9.8.0+266+1e661e97 · AlmaLinux:9Package registry (OSV)
almalinux:postgresql-contrib16.14-1.module_el9.8.0+266+1e661e97 · AlmaLinux:9Package registry (OSV)
almalinux:postgresql-docs16.14-1.module_el9.8.0+266+1e661e97 · AlmaLinux:9Package registry (OSV)
alpine:postgresql1515.18-r0 · Alpine:v3.20Package registry (OSV)
alpine:postgresql1616.14-r0 · Alpine:v3.20Package registry (OSV)
alpine:postgresql1717.10-r0 · Alpine:v3.21Package registry (OSV)
alpine:postgresql1818.4-r0 · Alpine:v3.23Package registry (OSV)
debian:postgresql-1515.18-0+deb12u1 · Debian:12Package registry (OSV)
debian:postgresql-1717.10-0+deb13u1 · Debian:13Package registry (OSV)
debian:postgresql-1818.4-1 · Debian:14Package registry (OSV)
opensuse:postgresql1414.23-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:postgresql1515.18-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:postgresql1616.14-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:postgresql1717.10-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:postgresql1818.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)

+37

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-10-12

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+151 d
  3. TodayOct 25, 2026+164 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-61 · UNIX Symbolic Link (Symlink) Following

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Exploit maturitynone → poc
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records