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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Redhat
  • Enterprise Linux
  • Enterprise Linux Eus
  • Hardened Images
  • Hummingbird
  • Rhel Aus
  • Rhel E4s
  • Rhel Eus
  • Rhel Eus Long Life
  • Rhel Tus

No data.

No data.

References
Link Providers
http://www.openwall.com/lists/oss-security/2026/09/09/3 cve-icon
http://www.openwall.com/lists/oss-security/2026/09/22/23 cve-icon
https://access.redhat.com/errata/RHSA-2026:85306 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85308 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85309 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85312 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85313 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85317 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85319 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85322 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85324 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:85325 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2026-87766 cve-icon cve-icon
https://bugs.debian.org/1145655 cve-icon cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2530542 cve-icon cve-icon
https://github.com/containers/bubblewrap/releases/tag/v0.12.0 cve-icon cve-icon cve-icon
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-87766 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-87766 cve-icon
https://www.openwall.com/lists/oss-security/2026/08/27/7 cve-icon cve-icon cve-icon
History

Mon, 19 Oct 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
CPEs cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:8::baseos
cpe:/o:redhat:enterprise_linux_eus:10.0
cpe:/o:redhat:rhel_e4s:9.2::baseos
Vendors & Products Redhat enterprise Linux Eus
References

Mon, 19 Oct 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel E4s
Redhat rhel Eus
Redhat rhel Tus
CPEs cpe:/o:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9::baseos
cpe:/o:redhat:rhel_e4s:8.8::baseos
cpe:/o:redhat:rhel_e4s:9.4::baseos
cpe:/o:redhat:rhel_eus:9.6::baseos
cpe:/o:redhat:rhel_tus:8.8::baseos
Vendors & Products Redhat rhel E4s
Redhat rhel Eus
Redhat rhel Tus
References

Mon, 19 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Aus
Redhat rhel Eus Long Life
CPEs cpe:/o:redhat:rhel_aus:8.4::baseos
cpe:/o:redhat:rhel_aus:8.6::baseos
cpe:/o:redhat:rhel_eus_long_life:8.4::baseos
cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
Vendors & Products Redhat rhel Aus
Redhat rhel Eus Long Life
References

Mon, 19 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:10.2
References

Tue, 22 Sep 2026 23:30:00 +0000

Type Values Removed Values Added
References

Sun, 13 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat hardened Images
Vendors & Products Redhat hardened Images

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

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

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

Updated: 2026-10-19T23:12:32.561Z

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

Link: CVE-2026-87766

cve-icon Vulnrichment

Updated: 2026-09-22T23:07:02.744Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-10-20T00:19:01.237

Link: CVE-2026-87766

cve-icon Redhat

Severity : Important

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

Links: CVE-2026-87766 - Bugzilla