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Vulnerability record · CVE-2026-84042 · published 10 September 2026

CVE-2026-84042: Improper privilege management vulnerability

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

7.8 CVSS 3.1 High EPSS 0.14% · top 97.5% CWE-269 · Improper privilege management Awaiting Analysis
7.8CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
15 Sep 2026Last modified by NVD

Description

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

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-84042
https://bugzilla.redhat.com/show_bug.cgi?id=2531222
https://github.com/containers/crun/

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Source: NIST National Vulnerability Database (record CVE-2026-84042), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.