Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

* python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat Security Advisory: python3 security update

Red Hat has issued a security advisory for python3 in Red Hat Enterprise Linux 8.4 variants addressing two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules that could lead to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API allowing arbitrary code execution. These vulnerabilities affect python3 packages in Red Hat Enterprise Linux 8.4 Advanced Update Support and Extended Update Support. The advisory rates the security impact as Important and provides updated packages to remediate these issues.

Two security vulnerabilities affecting Python 3.9 on Red Hat Enterprise Linux 9.6 Extended Update Support have been identified and addressed. The first (CVE-2026-6100) involves a use-after-free flaw in decompression modules that could lead to arbitrary code execution or information disclosure. The second (CVE-2026-4786) involves command injection via the webbrowser.open() API, also allowing arbitrary code execution. Red Hat has released updated python3.9 packages to remediate these issues. The update is rated as Important by Red Hat Product Security. No CVSS scores are provided in the advisory.

Red Hat Security Advisory: python3.9 security update

Red Hat has issued a security advisory for python3.9 in Red Hat Enterprise Linux 9.2 addressing two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules that can lead to arbitrary code execution or information disclosure, and CVE-2026-4786, an arbitrary code execution vulnerability via command injection in the webbrowser.open() API. These issues are rated with an important security impact by Red Hat. The advisory provides updated packages to remediate these vulnerabilities.

Red Hat has issued a security advisory for python3.9 addressing two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules that could lead to arbitrary code execution or information disclosure, and CVE-2026-4786, an arbitrary code execution vulnerability via command injection in the webbrowser.open() API. These issues affect Red Hat Enterprise Linux 9.0 variants on multiple architectures including aarch64, ppc64le, s390x, and x86_64. The update is rated as Important by Red Hat Product Security. No CVSS scores are provided in the advisory. The advisory includes updated packages to remediate these vulnerabilities.

A security advisory from Red Hat addresses two vulnerabilities in Python 3 affecting Red Hat Enterprise Linux 8.8 variants. The first vulnerability (CVE-2026-6100) involves arbitrary code execution or information disclosure via a use-after-free flaw in decompression modules. The second vulnerability (CVE-2026-4786) allows arbitrary code execution through command injection in the webbrowser.open() API. Red Hat has released updates to mitigate these issues in the affected Python packages.

This Red Hat security advisory addresses two vulnerabilities in the Python 3 packages for Red Hat Enterprise Linux 8.6. The first vulnerability (CVE-2026-6100) involves arbitrary code execution or information disclosure due to a use-after-free issue in decompression modules. The second vulnerability (CVE-2026-4786) allows arbitrary code execution via command injection in the webbrowser.open() API. These issues are rated as having an important security impact by Red Hat. Updates are available to remediate these vulnerabilities.

A security update for python3.12 in Red Hat Enterprise Linux 9.4 addresses two vulnerabilities: a use-after-free in decompression modules (CVE-2026-6100) and a command injection in the webbrowser.open() API (CVE-2026-4786). Both vulnerabilities could lead to arbitrary code execution or information disclosure. Red Hat has released updated packages to fix these issues in multiple architectures and product variants. The update is rated as Important by Red Hat Product Security. No CVSS scores are provided in the advisory. No known exploits are reported in the wild at this time.

Red Hat Security Advisory: python3.12 security update

Red Hat has issued a security advisory for python3.12 addressing two vulnerabilities: a use-after-free in decompression modules (CVE-2026-6100) and a command injection vulnerability in the webbrowser.open() API (CVE-2026-4786). These issues could lead to arbitrary code execution or information disclosure. The advisory affects Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder variants. The update is rated as Important by Red Hat Product Security. No CVSS score is provided in the advisory. A security update is available to remediate these vulnerabilities.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

* python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

* python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat Security Advisory: python3.11 security update

Red Hat has issued a security advisory for python3.11 addressing two vulnerabilities: CVE-2026-6100, a use-after-free flaw in decompression modules that could lead to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API that allows arbitrary code execution. These issues affect Red Hat Enterprise Linux 9.4 Extended Update Support and related variants. The advisory rates the impact as Important and provides updated packages to remediate the vulnerabilities.

Red Hat has issued a security advisory for python3.11 addressing two vulnerabilities: CVE-2026-6100, a use-after-free flaw in decompression modules that could lead to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API that allows arbitrary code execution. These issues affect Python as packaged in Red Hat Enterprise Linux 9.2 and related variants. The update is rated as important by Red Hat Product Security. No CVSS score is provided in the advisory. The advisory includes updated packages to remediate these vulnerabilities.

Red Hat has issued a security advisory for python3 in Red Hat Enterprise Linux 8 addressing two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules leading to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API allowing arbitrary code execution. These vulnerabilities are rated as important by Red Hat Product Security. Updates are available to remediate these issues.

Red Hat has issued a security advisory for python3.11 in Red Hat Enterprise Linux 8 addressing two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules leading to arbitrary code execution or information disclosure, and CVE-2026-4786, an arbitrary code execution vulnerability via command injection in the webbrowser.open() API. The update is rated as Important by Red Hat Product Security. The advisory provides updated packages to remediate these issues.

A security update for python3.9 in Red Hat Enterprise Linux 9 addresses two vulnerabilities: a use-after-free in decompression modules (CVE-2026-6100) that could lead to arbitrary code execution or information disclosure, and a command injection vulnerability in the webbrowser.open() API (CVE-2026-4786) that could allow arbitrary code execution. Red Hat has rated this update as Important and has released patches for affected packages. Users of Red Hat Enterprise Linux 9 and related CodeReady Linux Builder versions should apply the update to mitigate these issues.

Red Hat has issued a security advisory for python3.11 addressing two vulnerabilities: CVE-2026-6100, a use-after-free issue in decompression modules that could lead to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API that allows arbitrary code execution. The update is rated as important by Red Hat Product Security and affects Red Hat Enterprise Linux 9 and related variants. No CVSS scores are provided in the advisory. The advisory includes updated packages to remediate these issues.

A security update for python3.12 on Red Hat Enterprise Linux 9 addresses two vulnerabilities: CVE-2026-6100, a use-after-free in decompression modules that can lead to arbitrary code execution or information disclosure, and CVE-2026-4786, a command injection vulnerability in the webbrowser.open() API allowing arbitrary code execution. These issues have been rated as important by Red Hat Product Security. The update is available for multiple Red Hat Enterprise Linux 9 variants and related CodeReady Linux Builder products. No CVSS scores are provided in the advisory. No known exploits in the wild have been reported at this time.

cpython

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.

Search: CVE-2026-4786