High7.1Red Hat Linux

High [CVE-2026-4786] Arbitrary code execution via command injection in webbrowser.open() API

This high-severity Red Hat Linux advisory covers CVE-2026-4786 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7 Extended Lifecycle Support.

CVE-2026-4786 Published Apr 13, 2026

CVE-2026-4786

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Arbitrary code execution via command injection in webbrowser.open() API. Red Hat rates this important (CVSS 7.1).

Weakness: CWE-88. Affected package(s): python3.11, rhaiis/model-opt-cuda-rhel9:1782352950, rhaiis/vllm-spyre-rhel9:1782352919, rhpam, python3.9, python3.12.

Resolved in Red Hat advisory RHSA-2026:35838 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 16 more.

Affected versions

python3.11-0:3.11.11-2.el9_6.7
rhaiis/model-opt-cuda-rhel9:1782352950
rhaiis/vllm-spyre-rhel9:1782352919
rhpam-7/rhpam-kieserver-rhel8:7.13.5-4.1777325709
python3.9-0:3.9.10-4.el9_0.11
python3.12-0:3.12.1-4.el9_4.13
rhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.1777325708
rhelai3/bootc-aws-cuda-rhel9:1776871984
python3.12-0:3.12.9-1.el9_6.8
rhelai3/bootc-rocm-rhel9:1776773505
rhelai3/bootc-azure-rocm-rhel9:1776872005
rhpam-7/rhpam-businesscentral-rhel8:7.13.5-4.1777325711

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:35838

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:35838 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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