Server-side request forgery through an external DTD referenced by a
configuration file's DOCTYPE. Fixed on the 1.3 line in 1.3.15 (GHSA lists
logback-core < 1.3.15) by commit 2863a4974: SaxEventRecorder now overrides
resolveEntity() to ignore external DTDs and disables external general and
parameter entities. The 1.3.15 tag contains that code, and upstream's
SaxEventRecorderTest (event-ssrf.xml) runs in this spec's test block. trivy
matches only the 1.5.13 fixed version.