High RHSA-2026:35838 1 CVE

Red Hat Security Advisory: python3 security update

Published Jul 6, 2026 · Updated Oct 17, 2026

Ecosystem: Red Hat

Fixed packages 8

Release	Package	Fixed in
Red Hat · RHEL 7 ELS rhel_els:7	python3	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-debug	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-debuginfo	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-devel	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-idle	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-libs	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-test	0:3.6.8-21.el7_9.6
Red Hat · RHEL 7 ELS rhel_els:7	python3-tkinter	0:3.6.8-21.el7_9.6

Vulnerabilities 1

High 7.0

CVE-2026-4786

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

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.

Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Alpine Wolfi

Apr 13, 2026

References

article
https://access.redhat.com/security/updates/classification/#important
report
https://bugzilla.redhat.com/show_bug.cgi?id=2458049
advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_35838.json
report
https://access.redhat.com/security/cve/CVE-2026-4786
advisory
https://www.cve.org/CVERecord?id=CVE-2026-4786
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-4786
article
https://github.com/python/cpython/issues/148169
article
https://github.com/python/cpython/pull/148170
article
https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/