High RHSA-2026:9745 1 CVE

Red Hat Security Advisory: python3 security update

Published Apr 23, 2026 · Updated Oct 16, 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_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-debug	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-debuginfo	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-devel	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-idle	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-libs	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-test	0:3.6.8-21.el7_9.5
Red Hat · RHEL 7 ELS rhel_els:7	python3-tkinter	0:3.6.8-21.el7_9.5

Vulnerabilities 1

High 7.0

CVE-2026-4519

webbrowser.open() allows leading dashes in URLs

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().

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

Mar 20, 2026

References

article
https://access.redhat.com/security/updates/classification/#important
report
https://bugzilla.redhat.com/show_bug.cgi?id=2449649
advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_9745.json
report
https://access.redhat.com/security/cve/CVE-2026-4519
advisory
https://www.cve.org/CVERecord?id=CVE-2026-4519
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-4519
article
https://github.com/python/cpython/issues/143930
article
https://github.com/python/cpython/pull/143931
article
https://mail.python.org/archives/list/security-announce@python.org/thread/AY5NDSS433JK56Q7Q5IS7B37QFZVVOUS/