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CVE-2026-4519— webbrowser.open() allows leading dashes in URLs

CVSS 7.0 · High EPSS 0.31% · P23

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProductVersion RangeStatus
Python Software FoundationCPython< 3.10.21affected
3.11.0< 3.11.16affected
3.12.0< 3.12.14affected
3.13.0< 3.13.13affected
3.14.0< 3.14.4affected
3.15.0a1< 3.15.0a8affected
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I. Basic Information for CVE-2026-4519

Vulnerability Information
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Vulnerability Title
webbrowser.open() allows leading dashes in URLs
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
CPython 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全漏洞，该漏洞源于webbrowser.open() API接受URL中的前导破折号，可能被某些Web浏览器作为命令行选项处理，导致安全风险。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Python Software FoundationCPython 0 ~ 3.10.21 -

II. Public POCs for CVE-2026-4519

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6439 chars
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III. Intelligence Information for CVE-2026-4519

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Patches & Fixes for CVE-2026-4519 (14)

Mailing List Discussions for CVE-2026-4519 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2026-4519

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