CVE-2026-4786 | THREATINT

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.

PUBLISHED Reserved 2026-03-24 | Published 2026-04-13 | Updated 2026-04-29 | Assigner PSF

HIGH: 7.0CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-77

Product status

Default status

unaffected

Any version before 3.15.0

affected

Credits

an7y reporter

Seth Larson coordinator

Stan Ulbrych remediation developer

References

github.com/python/cpython/pull/148170 patch

github.com/python/cpython/issues/148169 issue-tracking

mail.python.org/.../thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/ vendor-advisory

github.com/...ommit/c5767a72838a8dda9d6dc5d3558075b055c56bca patch

github.com/...ommit/d22922c8a7958353689dc4763dd72da2dea03fff patch

github.com/...ommit/f4654824ae0850ac87227fb270f9057477946769 patch

github.com/...ommit/28b4ad38067bbdad34edfcd03ad2de5f06387e53 patch

github.com/...ommit/d6d68494be70bdbda20f89f83801ba52ec37daa4 patch

cve.org (CVE-2026-4786)

nvd.nist.gov (CVE-2026-4786)

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