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+|              |                                 |
+| :----------- | :------------------------------ |
+| Feature Name | Multi-Scan                      |
+| Start Date   | 6 November 2025                 |
+| Category     | Architecture                    |
+| RFC PR       | [fill this in after opening PR] |
+| State        | **ACCEPTED**                    |
+
+# Summary
+
+[summary]: #summary
+
+Support grype as an additional tool to scan for SBOMs.
+
+# Motivation
+
+[motivation]: #motivation
+
+We want to add support for `grype` in order to enrich the vulnerability reports, making them more complete and accurate.
+
+This will allow us to be vendor-neutral, since we are currently relying only on `trivy` to generate SBOMs and scan for vulnerabilities.
+
+Additionally, we discovered that `grype` is able to find more vulnerabilities than `trivy`. Below is a recap of our research:
+
+| image | `trivy` | `grype` |
+|-------|---------|---------|
+| `golang:1.12-alpine` | 45   | 210 |
+| `nginx:1.21.0` | 396 | 522 |
+| `redis:6.2.0-alpine` | 44 | 127 |
+| `postgres:13.0-alpine` | 63 | 151 |
+
+## Examples / User Stories
+
+[examples]: #examples
+
+### User story 1
+
+As a user, I want to make use of KEV and the EPSS score (which are currently provided by grype) to prioritize vulnerability remediation efforts.
+
+# Detailed design
+
+[design]: #detailed-design
+
+For this new feature, we are providing a way to enable it when scanning.
+
+This will impact the `ScanJob` CRD, adding a new boolean field called `multiScan`, set to `false` by default.
+
+To enable it, the `ScanJob` should be set like this:
+
+```yaml
+apiVersion: sbomscanner.kubewarden.io/v1alpha1
+kind: ScanJob
+metadata:
+  name: scanjob-example
+  namespace: default
+spec:
+  registry: example-registry
+  multiScan: true
+```
+
+## Scan
+
+For the multiscan feature, we are going to double the following operations:
+
+* sbom generation
+
+* sbom scan
+
+This will let `grype` generate its own report, so that we can then compare and merge with the one obtained with trivy.
+
+We can run the tools sequentially (1st trivy, 2nd grype) in case the `multiScan` field is set to `true` in the `ScanJob` CRD.
+
+## Merge
+
+The second phase of the multiscan process is about merging results.
+
+If both the scans succeed, then we can merge them together. We already have defined our own `VulnerabilityReport` format [here](./0004_vulnerability_report.md). Starting from here, we are going to enrich the struct with information that is exclusively provided by `grype`:
+
+* `kev` is a list of known exploits from the CISA KEV dataset.
+
+* `epss` is a list of Exploit Prediction Scoring System (EPSS) scores for the vulnerability.
+
+* `risk` is the score of the risk.
+
+* `licenses` is a list of the licenses used by all the components within the affected software.
+
+In addition to that, we are going to optionally update/overwrite already existing fields retrievied from `trivy`, in case `grype` has better results:
+
+* `cvss` version and scores.
+
+* `references` with additional links.
+
+* `description` if not provided by trivy.
+
+We cannot be sure that both tools will find the same results. For this reason, we have to adopt the following merging strategy:
+
+```
+vuln_report
+for vuln in trivy.vulnerabilities:
+  vuln_report add vuln
+  if grype has vuln:
+    vuln_report add grype.kev
+    vuln_report add grype.epss
+    ...
+for vuln in grype.vulnerabilities:
+  if vuln not in vuln_report:
+    vuln_report add vuln
+```
+
+# Drawbacks
+
+[drawbacks]: #drawbacks
+
+<!---
+Why should we **not** do this?
+
+  * obscure corner cases
+  * will it impact performance?
+  * what other parts of the product will be affected?
+  * will the solution be hard to maintain in the future?
+--->
+
+There are no specific concerns about this new feature.
+
+By default, the `multiScan` is not enabled, so the user will not hit performance issues.
+
+When the feature is enabled, an additional scan will run, and consequently, its results will be merged. This shouldn't have a huge impact, but users should keep this in mind when enabling it.
+