# RHSA-2026:1378: osbuild-composer security update

RHSA-2026:1378, released October 29, 2025, fixes 1 CVE in osbuild-composer (version 134.1-4.el10_0). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-1378
- Platform: Linux
- Released: Oct 29, 2025
- Priority: High (Closes CVE-2025-58183, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:1378

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [osbuild-composer](https://patchblox.com/security/data/product/linux/osbuild-composer.md) | RHEL 10 | 134.1-4.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-58183](https://patchblox.com/security/data/cve/CVE-2025-58183.md) | High | Unbounded allocation when parsing GNU sparse map in archive/tar | 8.2 | 0.0044 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo