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findIntroducedVersion picked the first CPE match with a versionStartIncluding, regardless of which vulnerable branch it described. When a CVE was fixed independently on multiple branches (e.g. perl CVE-2018-18311, fixed at 5.26.3 and separately at 5.28.1), this could pair an introduced version from one branch with the Alpine secfix from a different, unrelated branch, producing an inverted and unsatisfiable range (introduced > fixed). Scanners then treated every higher version as affected, causing false positives long after the real fix. Only use a candidate introduced version when it sorts before the Alpine fixed version, picking the closest qualifying one and falling back to "0" otherwise.
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findIntroducedVersion picked the first CPE match with a versionStartIncluding, regardless of which vulnerable branch it described. When a CVE was fixed independently on multiple branches (e.g. perl CVE-2018-18311, fixed at 5.26.3 and separately at 5.28.1), this could pair an introduced version from one branch with the Alpine secfix from a different, unrelated branch, producing an inverted and unsatisfiable range (introduced > fixed). Scanners then treated every higher version as affected, causing false positives long after the real fix.
Only use a candidate introduced version when it sorts before the Alpine fixed version, picking the closest qualifying one and falling back to "0" otherwise.
Fixes #5634