---
title: "CVE-2026-6473\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-6473?format=md
keywords: index, follow
---

# CVE-2026-6473

Publication date 14 May 2026

Last updated 25 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-6473?format=md#impact-score)

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## Description

Integer wraparound in multiple PostgreSQL server features allows an
unprivileged database user to cause the server to undersize an allocation
and write out-of-bounds. This may execute arbitrary code as the operating
system user running the database. In applications that pass gigabyte-scale
user inputs to the relevant database functions, the application input
provider may achieve a segmentation fault. Versions before PostgreSQL
18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-6473?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| postgresql-10 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 18.04 LTS bionic | Needs evaluation |
| postgresql-12 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 20.04 LTS focal | Needs evaluation |
| postgresql-14 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Fixed 14.23-0ubuntu0.22.04.1 |
| postgresql-16 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Fixed 16.14-0ubuntu0.24.04.1 |
| 22.04 LTS jammy | Not in release |
| postgresql-17 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Fixed 17.10-0ubuntu0.25.10.1 |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| postgresql-18 | 26.04 LTS resolute | Fixed 18.4-0ubuntu0.26.04.1 |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| postgresql-9.3 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 14.04 LTS trusty | Vulnerable, fix deferred |
| postgresql-9.5 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [leosilva](https://launchpad.net/~leosilva)

PostgreSQL 9.3 is end of life upstream, and no updates are
are available. Marking as deferred in -esm-main releases.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6473)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-6473)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-6473)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-6473)

### Related Ubuntu Security Notices (USN)

+ [USN-8294-1](https://usn.ubuntu.com/USN-8294-1)
+ PostgreSQL vulnerabilities
+ 21 May 2026

+ [USN-8653-1](https://usn.ubuntu.com/USN-8653-1)
+ PostgreSQL vulnerabilities
+ 20 August 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-6473>
* <https://www.postgresql.org/about/news/postgresql-184-1710-1614-1518-and-1423-released-3297/>
* <https://www.postgresql.org/support/security/CVE-2026-6473/>