CVE-2026-4786

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.
References
Link Resource
https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53
https://github.com/python/cpython/commit/a4d3edf3a6ecfde504d02126410d2a65a859b744
https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca
https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff
https://github.com/python/cpython/commit/d6d68494be70bdbda20f89f83801ba52ec37daa4
https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769
https://github.com/python/cpython/issues/148169
https://github.com/python/cpython/pull/148170
https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/
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
https://access.redhat.com/errata/RHSA-2026:10949
https://access.redhat.com/errata/RHSA-2026:10950
https://access.redhat.com/errata/RHSA-2026:11062
https://access.redhat.com/errata/RHSA-2026:11077
https://access.redhat.com/errata/RHSA-2026:11768
https://access.redhat.com/errata/RHSA-2026:13692
https://access.redhat.com/errata/RHSA-2026:13812
https://access.redhat.com/errata/RHSA-2026:14652
https://access.redhat.com/errata/RHSA-2026:14653
https://access.redhat.com/errata/RHSA-2026:14656
https://access.redhat.com/errata/RHSA-2026:16699
https://access.redhat.com/errata/RHSA-2026:17525
https://access.redhat.com/errata/RHSA-2026:17619
https://access.redhat.com/errata/RHSA-2026:19019
https://access.redhat.com/errata/RHSA-2026:19064
https://access.redhat.com/errata/RHSA-2026:19175
https://access.redhat.com/errata/RHSA-2026:19176
https://access.redhat.com/errata/RHSA-2026:19177
https://access.redhat.com/errata/RHSA-2026:19216
https://access.redhat.com/errata/RHSA-2026:19549
https://access.redhat.com/errata/RHSA-2026:19570
https://access.redhat.com/errata/RHSA-2026:19571
https://access.redhat.com/errata/RHSA-2026:19576
https://access.redhat.com/errata/RHSA-2026:19589
https://access.redhat.com/errata/RHSA-2026:19590
https://access.redhat.com/errata/RHSA-2026:21275
https://access.redhat.com/errata/RHSA-2026:21682
https://access.redhat.com/errata/RHSA-2026:22144
https://access.redhat.com/errata/RHSA-2026:25096
https://access.redhat.com/errata/RHSA-2026:26187
https://access.redhat.com/errata/RHSA-2026:28247
https://access.redhat.com/errata/RHSA-2026:28581
https://access.redhat.com/errata/RHSA-2026:30078
https://access.redhat.com/errata/RHSA-2026:30087
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/errata/RHSA-2026:35838
https://access.redhat.com/errata/RHSA-2026:8822
https://access.redhat.com/errata/RHSA-2026:8824
https://access.redhat.com/errata/RHSA-2026:9228
https://access.redhat.com/security/cve/CVE-2026-4786
https://bugzilla.redhat.com/show_bug.cgi?id=2458049
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4786.json
Configurations

No configuration.

History

No history.

Information

Published : 2026-04-13 22:16

Updated : 2026-08-13 01:16


NVD link : CVE-2026-4786

Mitre link : CVE-2026-4786

CVE.ORG link : CVE-2026-4786


JSON object : View

Products Affected

No product.

CWE
CWE-77

Improper Neutralization of Special Elements used in a Command ('Command Injection')

CWE-88

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')