---
id: CVE-2026-88265
title: A flaw was found in crun
summary: >-
  A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can
  follow a symlink and attach a host file to container stdio, then change that
  file's ownership. Affected versions are crun 1.29.1 and earlier. Default
  configura…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N'
cwe:
  - CWE-59
vendor: Red Hat
product: crun
affected:
  - crun (all versions)
published: '2026-09-10'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T16:17:38.437'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88265'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88265'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531224'
    label: secalert@redhat.com
  - url: 'https://github.com/containers/crun/'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88265.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88265'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88265'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00146
epssPercentile: 0.03176
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T17:28:48.530459Z'
ingestedAt: '2026-09-12T14:34:23.291Z'
---

## Overview

A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88265.json)