---
title: CVE-2026-50736
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-2026-50736
---

# CVE-2026-50736

Publication date 28 July 2026

Last updated 26 August 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-50736#impact-score)

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## Description

The pglogical queue mechanism, used to convey out-of-band commands such as
replicated DDL from a publisher to a subscriber, executes message payloads
on the subscriber at the privilege level of the apply worker, which is
equivalent to a PostgreSQL superuser in default installations. A party
acting as the publisher can send crafted queue messages that cause
arbitrary SQL to be executed on the subscriber as superuser, escalating
from a role permitted to use pglogical to full superuser and breaking the
isolation between tenants in shared deployments. To exploit the issue an
attacker must be able to direct a subscription at an endpoint they control.
In default installations this requires privileges normally reserved for a
superuser, so the issue is most relevant to managed deployments where the
ability to create subscriptions has been delegated to non-superuser roles.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| pglogical | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | 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)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-50736)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-50736)

**Base score**

9.0 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Attack requirements | Present |
  | Privileges required | Low |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | High |
  | Vulnerable system - Integrity impact | High |
  | Vulnerable system - Availability impact | High |
  | Subsequent system - Confidentiality impact | High |
  | Subsequent system - Integrity impact | High |
  | Subsequent system - Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.0 · Critical |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-50736)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-50736)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-50736)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-50736)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-50736>
* <https://github.com/2ndQuadrant/pglogical/releases/tag/REL2_4_8>
* <https://www.enterprisedb.com/docs/security/advisories/cve202650735/>