[IntelliJ] Uncaught Exception Error retrieving vulnerability data from GitHub Security Advisory API java.net.ConnectException

IntelliJ build version: 2026.2.0.1 IU-262.8665.337
OS: Linux
JDK: JetBrains s.r.o. 25.0.3
Plugin version: 3.97.7-2026.2
Additional Info: None
Parent component:

com.intellij.openapi.wm.impl.IdeRootPane[,0,0,1920x1248,layout=com.intellij.openapi.wm.impl.IdeRootPane$CustomHeaderRootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=449,maximumSize=,minimumSize=,preferredSize=]

Error message:

IdeaLoggingEvent[message=Error retrieving vulnerability data from GitHub Security Advisory API, throwable=java.net.ConnectException
	at <REDACTED: user-file-path>(HttpClientImpl.java:923)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.retrieveVulnerabilityData(CVECheckService.java:312)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.fetchCves(CVECheckService.java:241)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.getCveUpgradeIssues(CVECheckService.java:200)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.batchGetCVEIssues(CVECheckService.java:171)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.JavaUpgradeIssuesDetectionService.getCVEIssues(JavaUpgradeIssuesDetectionService.java:385)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.Java

Start with CVECheckService.retrieveVulnerabilityData at line 312, then trace callers through fetchCves, getCveUpgradeIssues, and batchGetCVEIssues. Investigate how the GitHub Security Advisory API connection failure is surfaced and identify the expected behavior for this uncaught exception; no test or concrete change is specified in the report.