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.
History

Wed, 09 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
References

Wed, 09 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 09 Sep 2026 12:15:00 +0000

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Metrics threat_severity

None

threat_severity

Important


Wed, 09 Sep 2026 08:45:00 +0000

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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.
Title Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-59
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-09-09T08:34:35.359Z

Updated: 2026-09-09T16:07:46.977Z

Reserved: 2026-09-09T08:08:33.568Z

Link: CVE-2026-87766

cve-icon Vulnrichment

Updated: 2026-09-09T16:07:46.977Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-09T09:17:12.540

Modified: 2026-09-09T17:17:52.587

Link: CVE-2026-87766

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-09T00:00:00Z

Links: CVE-2026-87766 - Bugzilla