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CVE-2026-4786

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

CVSS 7 HIGHEPSS 0.2%CWE-77
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.
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Productos afectados
Python Software Foundation · CPython

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Referencias
https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bcahttps://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fffhttps://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769https://github.com/python/cpython/issues/148169https://github.com/python/cpython/pull/148170https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/