Access of Resource Using Incompatible Type ('Type Confusion') Affecting github.com/containerd/containerd/oci package, versions >=1.7.27 <1.7.32>=2.0.4 <2.0.9>=2.1.0-beta.0 <2.2.4>=2.3.0-beta.0 <2.3.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMCONTAINERDCONTAINERDOCI-16795347
- published22 May 2026
- disclosed21 May 2026
- creditLei Wang
Introduced: 21 May 2026
CVE-2026-46680 Â (opens in a new tab)How to fix?
Upgrade github.com/containerd/containerd/oci to version 1.7.32, 2.0.9, 2.2.4, 2.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type ('Type Confusion') via improper handling of numeric User directives in container configuration. An attacker can gain elevated privileges by supplying a crafted image with an /etc/passwd file that maps a large numeric string to root, allowing the container to run as root even when restrictions are in place.
Workaround
This vulnerability can be mitigated by ensuring only trusted images are used, restricting image import permissions to trusted users, or enforcing a specific numeric runAsUser in the Kubernetes Pod securityContext.
PoC
A bug was found in containerd where containers launched with a numeric User directive that cannot be parsed as a 32-bit integer are incorrectly treated as a username. 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.