Affects containerd/runwasi ecosystem used widely to run Wasm workloads; allows native code exec in shim zygote from crafted OCI images, impacting many containerized environments.
CVE-2026-47218
Crafted OCI image can execute native code in containerd shim via trusted precompiled Wasm.
Is CVE-2026-47218 being exploited?
Not confirmed. CVE-2026-47218 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-47218?
CVE-2026-47218 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-47218?
Yes. A fix has been recorded for CVE-2026-47218. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-47218 affect?
CVE-2026-47218 affects containerd-shim-wasmtime (<0.6.1), runwasi-based shims using precompile-cache API, Downstream container runtimes built on runwasi. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-47218?
Upgrade to containerd-shim-wasmtime v0.6.1 and rebuild/update affected runwasi shims; audit OCI images.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Native code execution in shim zygote from crafted OCI image, granting container-level filesystem, env, credentials, network and syscall access.
Immediate action required
- affected< 0.6.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.