---
title: "CVE-2026-84042: crun - Privilege Escalation"
description: "crun >= 1.29 contains a privilege escalation caused by executing attacker-controlled payload from container image with host root privileges when built with libkrun and rootful passt networking, letting attackers gain host root privileges, exploit requires rootful container with passt networking enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-84042/
---

# CVE-2026-84042 crun - Privilege Escalation

crun >= 1.29 contains a privilege escalation caused by executing attacker-controlled payload from container image with host root privileges when built with libkrun and rootful passt networking, letting attackers gain host root privileges, exploit requires rootful container with passt networking enabled.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84042)

## Details

Type

Privilege Escalation

Impact

Privilege Escalation, Remote Code Execution

CVSS vector

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

Published

10 September 2026

Updated

15 October 2026

Weakness

[CWE-269](https://cwe.mitre.org/data/definitions/269.html)

## Vendor fix

Update to a version later than 1.29 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84042](https://nvd.nist.gov/vuln/detail/CVE-2026-84042)
- [https://access.redhat.com/security/cve/CVE-2026-84042](https://access.redhat.com/security/cve/CVE-2026-84042)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2531222](https://bugzilla.redhat.com/show_bug.cgi?id=2531222)
- [https://github.com/containers/crun/](https://github.com/containers/crun/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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