Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e5
- https://github.com/python/cpython/commit/a4d3edf3a6ecfde504d02126410d2a65a859b74
- https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bc
- https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03ff
- https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa
- https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f905747794676
- https://github.com/python/cpython/issues/148169
- https://github.com/python/cpython/pull/148170
- https://mail.python.org/archives/list/[email protected]/thread/JQDUNJ
- https://access.redhat.com/errata/RHSA-2026:10117
- https://access.redhat.com/errata/RHSA-2026:10140
- https://access.redhat.com/errata/RHSA-2026:10141
- https://access.redhat.com/errata/RHSA-2026:10711
- https://access.redhat.com/errata/RHSA-2026:10745
- https://access.redhat.com/errata/RHSA-2026:10774
FAQ
What is CVE-2026-4786?
CVE-2026-4786 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 u...
How severe is CVE-2026-4786?
CVE-2026-4786 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4786?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.