CVE-2026-88265
Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
Description
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.
INFO
Published Date :
Sept. 10, 2026, 9:17 a.m.
Last Modified :
Sept. 10, 2026, 9:17 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Restrict symlink following after pivot_root.
- Limit file access for container stdio.
- Monitor for unauthorized file ownership changes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88265.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-88265 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2531224 | |
| https://github.com/containers/crun/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88265 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88265
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88265 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88265 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N Added CWE CWE-59 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88265.json">CVE-2026-88265</a> Added Reference https://access.redhat.com/security/cve/CVE-2026-88265 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2531224 Added Reference https://github.com/containers/crun/