CLSA-2026-1778142589 python3: Fix of 2 CVEs

CVE-2026-4519: reject leading dashes in webbrowser URLs to block command-line option injection via webbrowser.open - CVE-2026-4786: validate the post-substitution URL in webbrowser UnixBrowser.open so that "%action" cannot smuggle a dash-prefixed flag past the CVE-2026-4519 dash-prefix check...

Code injection

DISPUTED Lib/webbrowser.py in Python through 3.6.3 does not validate strings before launching the program specified by the BROWSER environment variable, which might allow remote attackers to conduct argument-injection attacks via a crafted URL. NOTE: a software maintainer indicates that...