CVE-2026-4519 — Improper Input Validation in Software Foundation Cpython

CWE-20 — Improper Input ValidationCWE-88 — Argument Injection14 documents9 sources
Severity
7.0HIGHNVD
EPSS
0.0%
top 90.04%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Python Software Foundation Cpython
Timeline
PublishedMar 20
Latest updateApr 13

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().

CVSS 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

Affected Packages1 packages

▶CVEListV5python_software_foundation/cpython3.14.0 — 3.14.4+3

🔴Vulnerability Details

3
CVEList
webbrowser.open() allows leading dashes in URLs↗2026-03-20
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GHSA
GHSA-rm92-fj5q-mpj5: The webbrowser↗2026-03-20
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OSV
CVE-2026-4519: The webbrowser↗2026-03-20
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📋Vendor Advisories

4
Red Hat
python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API↗2026-04-13
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Red Hat
python: Python: Command-line option injection in webbrowser.open() via crafted URLs↗2026-03-20
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Microsoft
webbrowser.open() allows leading dashes in URLs↗2026-03-10
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Debian
CVE-2026-4519: jython - The webbrowser.open() API would accept leading dashes in the URL which could be...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-4519 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

5
Bugzilla
CVE-2026-4786 python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API↗2026-04-13
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Bugzilla
CVE-2026-4519 python3.15: Python: Command-line option injection in webbrowser.open() via crafted URLs [fedora-all]↗2026-03-20
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Bugzilla
CVE-2026-4519 python: Python: Command-line option injection in webbrowser.open() via crafted URLs↗2026-03-20
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Bugzilla
CVE-2026-4519 python3.13: Python: Command-line option injection in webbrowser.open() via crafted URLs [epel-all]↗2026-03-20
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Bugzilla
CVE-2026-4519 mingw-python3: Python: Command-line option injection in webbrowser.open() via crafted URLs [fedora-all]↗2026-03-20
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CVE-2026-4519 — Improper Input Validation | cvebase