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The vulnerability stems from unbounded JSON parsing in OCI image imports. The commit diff shows the vulnerable onUntarJSON function was modified to add a 20MB limit via io.LimitReader, replacing the dangerous io.ReadAll call. This function handles critical OCI metadata files during import, and the CWE-400/CWE-770 mapping confirms this is a resource exhaustion issue. While ImportIndex is mentioned in the Go vulnerability report, the direct vulnerability manifests in onUntarJSON which it likely calls.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| github.com/containerd/containerd | go | >= 1.6.0, < 1.6.18 | 1.6.18 |
| github.com/containerd/containerd | go | < 1.5.18 | 1.5.18 |
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