CVE-2026-46680
HIGHcontainerd user ID handling bypass allows runAsNonRoot evasion
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-46680. PoCs published by r0binak.
AI-analyzed exploit summary This repository demonstrates a container escape vulnerability (CVE-2026-46680) by exploiting a large UID (4294967296) to bypass Kubernetes' runAsNonRoot security context. The Dockerfile creates a user with UID 4294967296 (which overflows to 0, effectively root), and the pod.yaml deploys it with runAsNonRoot=true, bypassing the restriction.
Description
containerd is an open-source container runtime. In versions prior to 1.7.32, 2.0.9, 2.2.4 and 2.3.1, containers launched with a numeric User directive that cannot be parsed as a 32-bit integer are incorrectly treated as a username, leading to runAsNonRoot evasion. If a crafted image provides an /etc/passwd file mapping this large numeric string to root, the container ultimately runs as root (UID 0). This allows the Kubernetes runAsNonRoot restriction to be bypassed, causing unexpected behavior for environments that require containers to run as a non-root user. This issue has been fixed in versions 1.7.32, 2.0.9, 2.2.4 and 2.3.1.
Exploits (1)
This repository demonstrates a container escape vulnerability (CVE-2026-46680) by exploiting a large UID (4294967296) to bypass Kubernetes' runAsNonRoot security context. The Dockerfile creates a user with UID 4294967296 (which overflows to 0, effectively root), and the pod.yaml deploys it with runAsNonRoot=true, bypassing the restriction.
References (1)
Scores
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H