security: fix command injection in open_url via malicious homepage URL#31
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shanselman merged 1 commit intomainfrom Mar 18, 2026
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Security Fix: Command injection via open_url
Severity: High (all 3 models agreed: Codex, Gemini, Opus)
The Vulnerability
open_urlusedcmd /c start "" <url>to open package homepages. On Windows,cmd.exeinterprets&,|,>as command separators. A malicious package homepage likehttps://x.com&powershell -c maliciousexecutes arbitrary code when the user presseso.The Fix
cmd /c startwithexplorer.exeon Windows (no shell metacharacter interpretation)http://orhttps://before opening