# RHSA-2021:4158: python3-lxml security update

RHSA-2021:4158, released November 9, 2021, fixes 1 CVE in python3-lxml (version 0:4.2.3-3.el8). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-4158
- Platform: Linux
- Released: Nov 9, 2021
- Priority: High (Closes CVE-2021-28957, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:4158

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [python3-lxml](https://patchblox.com/security/data/product/linux/python3-lxml.md) | RHEL 8 | 0:4.2.3-3.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-28957](https://patchblox.com/security/data/cve/CVE-2021-28957.md) | High | python39-rpm-macros: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, excepti... | 9.1 | 0.0404 |  |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo