CVE-2025-3931: Yggdrasil: local privilege escalation in yggdrasil

Vulnerability summary

CVE-2025-3931 is a high (CVSS 7.8) vulnerability in yggdrasil Go. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.3% of scored vulnerabilities.

Timeline

1. 14-05-2025
   PublishedVulnerability first disclosed.
2. 11-11-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-280Improper Handling of Insufficient Permissions or PrivilegesThe product does not handle or incorrectly handles when it has insufficient privileges to access resources or functionality as specified by their permissions. This may cause it to follow unexpected code paths that may leave the product in an invalid state.