The OVAL analyzer falsely assumes that any vulnerabilities detected on a
host only come from OVAL. However, it is possible that NVD detects
vulnerabilities on these hosts even though it excludes software from
deb_packages and rpm_packages. For example, a python package twisted
v22.20 has a vulnerability CVE-2022-39348 detected by NVD. The OVAL
analyzer would delete this vulnerability, and it would be re-inserted by
the NVD scanner on the next run. This creates a loop.
The fix is to only delete vulnerabilities that are actually detected
using OVAL. We already store this in the source column in the
software_cve table.
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