CVE-2026-84042CWE-269privilege-escalation

CVE-2026-84042

High · published September 10, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
0.8
In the wild
Unconfirmed
What it is

A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00100 · 0.8th percentile
Weakness
CWE-269 · Improper Privilege Management
Published
2026-09-10T13:17Z
References (3)
https://access.redhat.com/security/cve/CVE-2026-84042 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2531222 · [email protected]https://github.com/containers/crun/ · [email protected]
EPSS history
Timeline
  • 11 SEP 03:19Z
    EPSS moved — → 0%
    epss
  • 10 SEP 08:24Z
    Crun: crun: rootful krun with passt executes container payload as host root
    cvelistv5