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.
Published: 2026-09-09
Score: 8.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Do not create files on untrusted content with unpatched bwrap. Do not install untrusted Flatpaks. No upstream fix for older setuid builds.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
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'}


Subscriptions

Redhat Enterprise Linux Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-09T09:59:58.220Z

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

Link: CVE-2026-87766

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

Modified: 2026-09-09T10:22:34.290

Link: CVE-2026-87766

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-59

    Improper Link Resolution Before File Access ('Link Following')