Input validation error in containerd - CVE-2026-46680
Published: May 21, 2026
Vulnerability identifier: #VU132013
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46680
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: containerd
Affected software:
containerd
containerd
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass runAsNonRoot restrictions and run a container as root.
The vulnerability exists due to improper input validation in user ID handling when processing a numeric User directive that cannot be parsed as a 32-bit integer. A remote attacker can provide a crafted image with an /etc/passwd file mapping the large numeric string to root to bypass runAsNonRoot restrictions and run a container as root.
The issue occurs when the large numeric User value is incorrectly treated as a username instead of a numeric UID.
How to mitigate CVE-2026-46680
Install security update from vendor's website.