# RHSA-2026:85306: bubblewrap security update

RHSA-2026:85306, released October 20, 2026, fixes 1 CVE in bubblewrap (version 0:0.4.0-3.el8_10). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-85306
- Platform: Linux
- Released: Oct 20, 2026
- Priority: High (Closes CVE-2026-87766, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:85306

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [bubblewrap](https://patchblox.com/security/data/product/linux/bubblewrap.md) | RHEL 8 | 0:0.4.0-3.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-87766](https://patchblox.com/security/data/cve/CVE-2026-87766.md) | High | Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup | 8.8 | 0.0021 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo