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FreeBSD : python -- more webbrowser.open() command injection vulnerabilities (cf75f572-378a-11f1-a119-e36228bfe7d4)

high Nessus Plugin ID 307388

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 cf75f572-378a-11f1-a119-e36228bfe7d4 advisory.

 Seth Larson reports:
 [CVE-2026-4786] Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open() There is a HIGH severity vulnerability affecting CPython.
 Mitgation of CVE-2026-4519 was incomplete. If the URL contained %action the mitigation could be bypassed for certain browser types the webbrowser.open() API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

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://github.com/python/cpython/issues/148169

https://github.com/python/cpython/pull/148170

http://www.nessus.org/u?888979f8

https://www.cve.org/CVERecord?id=CVE-2026-4786

http://www.nessus.org/u?ade07f4f

Plugin Details

Severity: High

ID: 307388

File Name: freebsd_pkg_cf75f572378a11f1a119e36228bfe7d4.nasl

Version: 1.1

Type: Local

Published: 4/17/2026

Updated: 4/17/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-4786

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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: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: 4/13/2026

Vulnerability Publication Date: 2/12/2026

Reference Information

CVE: CVE-2026-4786

IAVA: 2026-A-0142-S