Name: CVE-2026-4519: Improper Input Validation
Creator: Rapid7
Published: 2026-03-20T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-4519, CWE-20, CWE-88, CVSS 3.3, EPSS 0.00406

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().

CVSS Details

CVSS 4.0 Base Score: 7 (HIGH)
CVSS 4.0 Vector: (CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 3.3
CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade python3.12-testUpgrade python3.11-tkinterUpgrade python3-libsUpgrade python3-idleUpgrade python3.12-develUpgrade platform-python-develUpgrade python3.14Upgrade python3.11-testUpgrade python3.12-rpm-macrosUpgrade platform-python-debugUpgrade python-unversioned-commandUpgrade python3Upgrade python3.14-freethreading-libsUpgrade python3.14-freethreading-debugUpgrade python3.12-idleUpgrade python3.14-debugUpgrade python3-develUpgrade python3.11-libsUpgrade python3.14-freethreading-develUpgrade python3.14-testUpgrade python3.11Upgrade python3.14-freethreading-testUpgrade python3.12-libsUpgrade python3.14-tkinterUpgrade python3.14-freethreading-idleUpgrade python3.14-libsUpgrade python3.14-freethreading-tkinterUpgrade python3.14-develUpgrade platform-pythonUpgrade python3-testUpgrade python3-debugUpgrade python3.11-debugUpgrade python3.12-tkinterUpgrade python3.14-idleUpgrade python3.12-debugUpgrade python3.11-idleUpgrade python3.14-freethreadingUpgrade python3.11-develUpgrade python3.11-rpm-macrosUpgrade python3-tkinterUpgrade python3.12	Apr 2, 2026	Mar 31, 2026
Alpine Linux	—	Upgrade python3	Aug 17, 2026	Mar 20, 2026
Amazon Linux Ami 2	—	Upgrade pythonUpgrade python3-libsUpgrade python3-tkinterUpgrade python-libsUpgrade python-debugUpgrade python3-develUpgrade python3-debuginfoUpgrade python-toolsUpgrade python3Upgrade python3-toolsUpgrade python-debuginfoUpgrade python-develUpgrade tkinterUpgrade python3-testUpgrade python3-debugUpgrade python-test	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade python3.11-idleUpgrade python3.13-develUpgrade python3-debugUpgrade python3.12-idleUpgrade python3.13-idleUpgrade python3.13-debugUpgrade python3.13Upgrade python3.11-tkinterUpgrade python3.14-freethreading-debugUpgrade python3.13-tkinterUpgrade python3.14Upgrade python3.11-debugsourceUpgrade python3.13-testUpgrade python3.14-debugUpgrade python3.14-freethreading-tkinterUpgrade python3.12-testUpgrade python3.12-tkinterUpgrade python3.14-freethreading-idleUpgrade python3.12-debuginfoUpgrade python3.11-libsUpgrade python3-testUpgrade python3.12Upgrade python3.14-develUpgrade python3.11-testUpgrade python3-tkinterUpgrade python3-libsUpgrade python3.12-develUpgrade python3.12-debugUpgrade python3.14-freethreading-testUpgrade python3.11-develUpgrade python3.12-libsUpgrade python3.13-freethreading-debugUpgrade python3.14-debuginfoUpgrade python3.14-tkinterUpgrade python3.13-freethreadingUpgrade python-unversioned-commandUpgrade python3.13-debugsourceUpgrade python3-idleUpgrade python3.13-debuginfoUpgrade python3.9-debuginfoUpgrade python3.14-freethreadingUpgrade python3.14-idleUpgrade python3.11Upgrade python3.14-debugsourceUpgrade python3.14-testUpgrade python3.14-libsUpgrade python3.13-libsUpgrade python3.11-debugUpgrade python3.11-debuginfoUpgrade python3.14-freethreading-develUpgrade python3.12-debugsourceUpgrade python3Upgrade python3-develUpgrade python3.9-debugsourceUpgrade python3.14-freethreading-libs	Apr 14, 2026	Mar 20, 2026
Debian	—	Upgrade python3.11Upgrade python3.13Upgrade python3.9	May 17, 2026	May 17, 2026
Freebsd	—	Upgrade python312Upgrade python311Upgrade python313tUpgrade python314Upgrade python310Upgrade python313	Apr 2, 2026	Apr 1, 2026
Nutanix Ahv	—	Upgrade Nutanix AHV to the latest version	Jun 5, 2026	Jun 2, 2026
Oracle_linux	—	Upgrade platform-python-debugUpgrade python3.11Upgrade pythonUpgrade python3-libsUpgrade python-unversioned-commandUpgrade platform-pythonUpgrade python3.12-idleUpgrade python3-develUpgrade python3-idleUpgrade tkinterUpgrade python3.12-rpm-macrosUpgrade platform-python-develUpgrade python3.11-tkinterUpgrade python-debugUpgrade python3.11-testUpgrade python3.11-debugUpgrade python-toolsUpgrade python3.12-develUpgrade python3.12-tkinterUpgrade python3.11-libsUpgrade python-testUpgrade python3-testUpgrade python3.11-rpm-macrosUpgrade python3.12-debugUpgrade python3.12-testUpgrade python3-debugUpgrade python-libsUpgrade python3.12Upgrade python3.11-idleUpgrade python-develUpgrade python3.12-libsUpgrade python3.11-develUpgrade python3-tkinterUpgrade python3	Apr 1, 2026	Mar 20, 2026
Redhat_linux	—	Upgrade python3-tkinterUpgrade python3.9-debuginfoUpgrade python3.11Upgrade python3.12-rpm-macrosUpgrade python3-debugsourceUpgrade python3.11-libsUpgrade python3.14-testUpgrade python3-idleUpgrade python-debugUpgrade platform-python-debugUpgrade python3.14-freethreadingUpgrade python3.12-testUpgrade python3.11-debuginfoUpgrade python3.12-debugsourceUpgrade python-toolsUpgrade python3.14-freethreading-libsUpgrade python3-libsUpgrade python3.12-develUpgrade python3.14-debugUpgrade python3.14-freethreading-develUpgrade python-debuginfoUpgrade python3.14-freethreading-debugUpgrade python3-develUpgrade platform-python-develUpgrade python-unversioned-commandUpgrade python3.14Upgrade python3.11-tkinterUpgrade python3.14-freethreading-testUpgrade pythonUpgrade python3.9-debugsourceUpgrade python3-debuginfoUpgrade python3.11-testUpgrade python3.12-idleUpgrade tkinterUpgrade python3.14-libsUpgrade python-develUpgrade python3.12-tkinterUpgrade python3.14-freethreading-tkinterUpgrade python3.12Upgrade python3.11-rpm-macrosUpgrade python3.12-libsUpgrade python3.11-develUpgrade python-testUpgrade python3.12-debuginfoUpgrade python-libsUpgrade python3-testUpgrade python3.11-debugsourceUpgrade python3.14-tkinterUpgrade python3.14-freethreading-idleUpgrade python3.14-debuginfoUpgrade python3.11-debugUpgrade python3.14-idleUpgrade python3.14-debugsourceUpgrade python3.14-develUpgrade python3.12-debugUpgrade python3-debugUpgrade python3Upgrade platform-pythonUpgrade python3.11-idle	Apr 1, 2026	Mar 20, 2026
Rocky_linux	—	Upgrade python3.12-debugUpgrade python3.14-libsUpgrade python3.11-debugUpgrade python3.12Upgrade python3.11-tkinterUpgrade python3.14-develUpgrade python3.12-tkinterUpgrade python3.14-testUpgrade python3.9-debugsourceUpgrade python3Upgrade python3.14-debuginfoUpgrade python3.11-develUpgrade python3.11-debugsourceUpgrade python3.12-libsUpgrade python3.14-freethreading-idleUpgrade python3.14-freethreading-libsUpgrade python3.14-freethreading-tkinterUpgrade python3.14Upgrade platform-pythonUpgrade python3.12-debugsourceUpgrade python3.14-freethreading-testUpgrade python3.11-testUpgrade python3.14-debugsourceUpgrade python3.12-debuginfoUpgrade python3.11Upgrade python3.14-idleUpgrade python3-debugUpgrade python3-testUpgrade python3.11-libsUpgrade python3.14-debugUpgrade platform-python-debugUpgrade python3.11-idleUpgrade python3.11-debuginfoUpgrade python3-libsUpgrade python3-idleUpgrade python3.9-debuginfoUpgrade python3.14-freethreading-develUpgrade python3.14-freethreading-debugUpgrade python3.12-testUpgrade python3.12-develUpgrade python3-develUpgrade python3-tkinterUpgrade python3.14-tkinterUpgrade python3.14-freethreadingUpgrade python3.12-idleUpgrade platform-python-devel	Apr 8, 2026	Apr 7, 2026
Suse	—	Upgrade python312-doc-devhelpUpgrade python311-baseUpgrade python311-testsuiteUpgrade python39-doc-devhelpUpgrade python310-develUpgrade python313-nogil-idleUpgrade python313-toolsUpgrade python39-toolsUpgrade python-idleUpgrade python310-base-32bitUpgrade python-baseUpgrade python3-doc-devhelpUpgrade python311-idleUpgrade python3-cursesUpgrade python313-dbmUpgrade python311-32bitUpgrade libpython3_12-1_0-32bitUpgrade libpython3_13t1_0Upgrade libpython3_11-1_0Upgrade pythonUpgrade python310-baseUpgrade python36Upgrade python39-base-32bitUpgrade python-doc-pdfUpgrade python313-nogil-testsuiteUpgrade python313-x86-64-v3Upgrade python310-32bitUpgrade python-xmlUpgrade python310-dbmUpgrade python313-cursesUpgrade python39-idleUpgrade python311-tkUpgrade python312-32bitUpgrade python310-doc-devhelpUpgrade libpython3_10-1_0-32bitUpgrade libpython3_10-1_0Upgrade libpython3_6m1_0Upgrade python3-testsuiteUpgrade python3-dbmUpgrade python313-docUpgrade python313-idleUpgrade python312-base-32bitUpgrade python313-nogil-tkUpgrade libpython3_4m1_0-32bitUpgrade libpython2_7-1_0-32bitUpgrade python313-testsuiteUpgrade python310-cursesUpgrade libpython3_9-1_0Upgrade python310-idleUpgrade python39-baseUpgrade python39-docUpgrade python313-nogil-dbmUpgrade python39-develUpgrade libpython3_13-1_0Upgrade python39-tkUpgrade python312-docUpgrade python311-cursesUpgrade python311-doc-devhelpUpgrade python36-baseUpgrade python-tkUpgrade libpython3_6m1_0-32bitUpgrade python311Upgrade python311-develUpgrade python310Upgrade python3-docUpgrade python310-tkUpgrade python310-toolsUpgrade libpython2_7-1_0Upgrade python313Upgrade python312-idleUpgrade python310-testsuiteUpgrade libpython3_9-1_0-32bitUpgrade libpython3_11-1_0-32bitUpgrade python313-doc-devhelpUpgrade python313-nogil-develUpgrade python312Upgrade python-gdbmUpgrade python-cursesUpgrade python312-baseUpgrade python3-idleUpgrade python3-baseUpgrade python313-nogil-cursesUpgrade python312-cursesUpgrade libpython3_13-1_0-x86-64-v3Upgrade python39-32bitUpgrade python39-testsuiteUpgrade python39Upgrade python313-nogil-baseUpgrade python312-testsuiteUpgrade python312-dbmUpgrade python311-base-32bitUpgrade python3-develUpgrade python-docUpgrade libpython3_4m1_0Upgrade python313-develUpgrade python312-develUpgrade python-demoUpgrade python-base-32bitUpgrade python-develUpgrade python313-nogil-toolsUpgrade python312-tkUpgrade python313-tkUpgrade python312-toolsUpgrade python311-dbmUpgrade python310-docUpgrade python39-dbmUpgrade python313-base-x86-64-v3Upgrade python39-cursesUpgrade python313-nogilUpgrade python-32bitUpgrade libpython3_12-1_0Upgrade python3Upgrade python313-baseUpgrade python36-develUpgrade python311-docUpgrade python3-toolsUpgrade python3-tkUpgrade python311-tools	Apr 8, 2026	Apr 1, 2026
Ubuntu	—	Upgrade python3.10Upgrade libpython3.14Upgrade libpython3.12t64Upgrade python3.12Upgrade libpython3.10Upgrade python3.14	Jul 6, 2026	Mar 20, 2026
Vmware Photon_os	—	Use 'tdnf update' to upgrade all packages to the latest version.	May 27, 2026	Mar 20, 2026

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CVSS Details

Covered by Rapid7

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