containerd runwasi up to 0.6.0 Precompile Cache privileges management

Summaryinfo

A vulnerability classified as very critical was found in containerd runwasi up to 0.6.0. This impacts an unknown function of the component Precompile Cache. Such manipulation leads to privileges management. This vulnerability is referenced as CVE-2026-47218. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in containerd runwasi up to 0.6.0. Affected by this issue is an unknown function of the component Precompile Cache. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

runwasi facilitates running Wasm and WASI workloads managed by containerd. Prior to 0.6.1, containerd-shim-wasmtime-v1 can treat Wasmtime precompiled bytes supplied directly in an OCI image layer as a trusted artifact from the precompile-cache path and deserialize them as native code. An attacker who causes a victim to run a crafted image can bypass WebAssembly validation and execute native code in the shim zygote process, gaining the filesystem, environment, credentials, networking, and Linux syscall access available to the workload container. Downstream shims built with runwasi's containerd-shim-wasm precompile-cache API are also affected if they implement Compiler and trust executable precompiled artifacts from OCI image layers; the 0.6.1 boundary applies specifically to containerd-shim-wasmtime and does not independently certify downstream product releases. The flaw escapes the WASI sandbox to the workload container boundary, but it does not by itself bypass container isolation or provide direct host code execution. This issue is fixed in version 0.6.1.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-47218 since 05/19/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/15/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 0.6.1 eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• containerd

Name

• runwasi

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6.0

Website

• Product: https://github.com/containerd/runwasi/

CPE 2.3info

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CPE 2.2info

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