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CVE-2026-4519

webbrowser.open() allows leading dashes in URLs

Published: Mar 20, 2026Updated: Jul 15, 2026 Sources: CVE List NVD BDUCWE-20
3.3LOW
NVD MITRE
EPSS Score
0.3%
Top 76.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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().

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:NI:LA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-20CWE-88

Affected Products

Red Hat Inc.
commercial·USaka red hat
Red Hat Enterprise LinuxOn-premOS
Operating Systems / linux-distro
Red Hat DiscoveryOn-prem
Operating Systems / linux-distro
Red Hat AI Inference ServerOn-prem
Operating Systems / linux-distro
Red Hat Update InfrastructureOn-prem
Operating Systems / linux-distro
Red Hat Hardened ImagesOn-prem
Operating Systems / linux-distro
RHEL-8 based Middleware ContainersOn-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux AIOn-prem
Operating Systems / linux-distro
Сообщество свободного программного обеспечения
oss-projectaka fsf
Debian GNU/LinuxOn-premOS
Operating Systems / linux-distro
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
Python Software Foundation
oss-project·USaka psf
CPython
OSS Libraries
python
oss-project·US
pythonLibraryLibrary
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/python/cpython/commit/591ed890270c5697b013bf637029fb3e6cd2d73e
github.com
https://github.com/python/cpython/commit/89bfb8e5ed3c7caa241028f1a4eac5f6275a46a4
github.com
https://github.com/python/cpython/commit/9669a912a0e329c094e992204d6bdb8787024d76
github.com
and 88 more references View all →

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