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CVE PROGRAM SOURCE RECORD7.0 High

CVE-2026-4786

Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

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Status
Published
Published
Updated
Assigning organization
PSF

Description

Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Python Software Foundation CPython

Default version status: unaffected

  • 0 to < 3.10.21affected
  • 3.11.0 to < 3.11.16affected
  • 3.12.0 to < 3.12.14affected
  • 3.13.0 to < 3.13.14affected
  • 3.14.0a1 to < 3.14.5rc1affected
  • 3.15.0a1 to < 3.15.0b1affected

References