CVE-2026-4519

Summary

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().

Affected Software

VendorProductVersion RangeStatus
Python Software FoundationCPython0 < 3.13.13affected
Python Software FoundationCPython3.14.0 < 3.14.4affected
Python Software FoundationCPython3.15.0a1 < 3.15.0a8affected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

python: Python: Command-line option injection in webbrowser.open() via crafted URLs

Additional References

References