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FreeBSD : Python -- The webbrowser.open() API allows leading dashes (9fdad262-2e0f-11f1-88c7-00a098b42aeb)

high Nessus Plugin ID 304665

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 9fdad262-2e0f-11f1-88c7-00a098b42aeb advisory.

 https://github.com/python/cpython/pull/143931 reports:
 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().

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://cveawg.mitre.org/api/cve/CVE-2026-4519

http://www.nessus.org/u?4cebcafd

Plugin Details

Severity: High

ID: 304665

File Name: freebsd_pkg_9fdad2622e0f11f188c700a098b42aeb.nasl

Version: 1.3

Type: Local

Published: 4/2/2026

Updated: 4/17/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-4519

CVSS v3

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.9

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7

Threat Score: 3.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:python313t, p-cpe:/a:freebsd:freebsd:python312, p-cpe:/a:freebsd:freebsd:python310, p-cpe:/a:freebsd:freebsd:python313, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:python311, p-cpe:/a:freebsd:freebsd:python314

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 4/1/2026

Vulnerability Publication Date: 3/20/2026

Reference Information

CVE: CVE-2026-4519