SECURITY UPDATE: command-line option injection in webbrowser.open()
through a URL whose "%action" substitution yields a leading dash
debian/patches/CVE-2026-4519.patch: carries the fix, applied since
tuxcare.els1: Lib/webbrowser.py UnixBrowser.open() checks the URL
after the %action substitution
debian/patches/CVE-2026-4786.patch: add the upstream regression
test in Lib/test/test_webbrowser.py