Critical 9.3Published Oct 15, 2026

CVE-2026-47218runwasi: Forged Wasmtime precompiled OCI layer bypasses runwasi WASI sandbox

Updated under an hour ago (2026-10-19 05:50 UTC)

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It affects containerd runwasi. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.39%, higher than 32% of scored CVEs.

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Every CVE for containerd runwasi

Exploited in the last 30 days

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.

CVSS: 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.39% (percentile 32)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

containerd runwasi containerd:runwasi (from the name)	before 0.6.1	CNA record

References

https://github.com/containerd/runwasi/security/advisories/GHSA-cc25-vq59-rcjxx-refsource-confirm
https://github.com/containerd/runwasi/commit/d28ab73c2c8a6c50d1927078821bd418b9e51638x-refsource-misc
https://github.com/containerd/runwasi/releases/tag/containerd-shim-wasmtime/v0.6.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.