# RHBA-2026:21388: cockpit security update

RHBA-2026:21388, released March 31, 2026, fixes 2 CVEs in cockpit (version 356.1-1.el10_2). None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/linux/rhba-2026-21388
- Platform: Linux
- Released: Mar 31, 2026
- Priority: Urgent (Closes CVE-2026-4800, rated Critical)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHBA-2026:21388

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [cockpit](https://patchblox.com/security/data/product/linux/cockpit.md) | RHEL 10 | 356.1-1.el10_2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-4800](https://patchblox.com/security/data/cve/CVE-2026-4800.md) | Urgent | cockpit-ws-selinux: Cockpit enables users to administer GNU/Linux servers using a web browser | 9.8 | 0.0281 |  |
| [CVE-2026-2950](https://patchblox.com/security/data/cve/CVE-2026-2950.md) | Routine | cockpit: Impact: Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions | 6.5 | 0.0034 |  |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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