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Fencer Vulns
high 7.8

CVE-2025-3931 json

Yggdrasil: local privilege escalation in yggdrasil

published 2025-05-14 17 mo ago modified 2026-11-04 4 d ago also GHSA-rpg2-jvhp-h354 , GO-2025-3688 , EUVD-2025-14867

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

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. 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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:0.4.5-3.el10_0
  • yggdrasil RHEL 10.0 0.4.5-3.el10_0

red hat advisories RHSA-2025:7592

  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250515T200012-1.1

opensuse advisories openSUSE-SU-2025:15135-1

  • yggdrasil AlmaLinux 10 0.4.5-3.el10_0

almalinux advisories ALSA-2025:7592

  • yggdrasil Rocky Linux 10 0.4.5-3.el10_0

rocky linux advisories RLSA-2025:7592

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-3931 updated cvss 7.8

yggdrasil: Local privilege escalation in yggdrasil

  • Red Hat Enterprise Linux AppStream (v. 10) yggdrasil 0.4.5-3.el10_0 Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) yggdrasil-devel 0.4.5-3.el10_0, yggdrasil-debuginfo 0.4.5-3.el10_0, yggdrasil-debugsource 0.4.5-3.el10_0, yggdrasil-examples-debuginfo 0.4.5-3.el10_0
    fixed: vendor fix “Mitigation is either unavailable or does not meet Red Hat Product Security standards for usability, deployment, applicability, or stability.” RHSA-2025:7592
  • Red Hat Enterprise Linux 8 rhc-worker-playbook Red Hat Enterprise Linux 9 rhc-worker-playbook Red Hat Enterprise Linux 10 rhc-worker-playbook Red Hat Satellite 6 yggdrasil
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
17 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/redhatinsights/yggdrasil
<=0.4.6
all versions
 no fix listed

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Satellite 6

Classification

Weakness
  • CWE-280 Improper Handling of Insufficient Permissions or Privileges

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.