---
id: CVE-2025-3931
title: 'Yggdrasil: local privilege escalation in yggdrasil'
summary: >-
  A flaw was found in Yggdrasil, which acts as a system broker, allowing the
  processes to communicate to other children's "worker" processes through the
  DBus component. Yggdrasil creates a DBus method to dispatch messages to
  workers. Howev…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-280
vendor: Red Hat
product: yggdrasil
affected:
  - yggdrasil < 0.4.7
  - yggdrasil (all versions)
  - rhc-worker-playbook
  - rhc-worker-playbook
  - rhc-worker-playbook
  - yggdrasil
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-05-14T13:26:50.331377Z'
published: '2025-05-14'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T21:29:51.329Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-3931'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:7592'
    label: 'RHSA-2025:7592'
  - url: 'https://access.redhat.com/security/cve/CVE-2025-3931'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2362345'
    label: RHBZ#2362345
  - url: 'https://github.com/RedHatInsights/yggdrasil/pull/336'
tags:
  - cve.org
epss: 0.00181
epssPercentile: 0.07734
ingestedAt: '2026-11-05T21:36:00.616Z'
---

## Overview

A flaw was found in Yggdrasil, which acts as a system broker, allowing the processes to communicate to other children's "worker" processes through the DBus component. Yggdrasil creates a DBus method to dispatch messages to workers. However, it misses authentication and authorization checks, allowing every system user to call it. One available Yggdrasil worker acts as a package manager with capabilities to create and enable new repositories and install or remove packages. 

This flaw allows an attacker with access to the system to leverage the lack of authentication on the dispatch message to force the Yggdrasil worker to install arbitrary RPM packages. This issue results in local privilege escalation, enabling the attacker to access and modify sensitive system data.

## Affected

- `yggdrasil < 0.4.7`
- `yggdrasil (all versions)`
- `rhc-worker-playbook`
- `rhc-worker-playbook`
- `rhc-worker-playbook`
- `yggdrasil`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.