# CVE-2026-87766

## Summary

- **CVE ID:** CVE-2026-87766
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-59
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-87766)
- [CNA](https://bugs.debian.org/1145655)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2530542)
- [CNA](https://github.com/containers/bubblewrap/releases/tag/v0.12.0)
- [CNA](https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx)
- [CNA](https://www.openwall.com/lists/oss-security/2026/08/27/7)
- [CVE](http://www.openwall.com/lists/oss-security/2026/09/09/3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._