High 8.8Published Sep 9, 2026

CVE-2026-87766Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

Updated under an hour ago (2026-10-19 13:00 UTC)

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It affects Red Hat Enterprise Linux 10 and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-59
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Sep 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record
Red Hat Red Hat Hardened Images redhat:hummingbird	1	CNA record

References

https://access.redhat.com/security/cve/CVE-2026-87766vdb-entry, x-refsource-redhat
https://bugs.debian.org/1145655
https://bugzilla.redhat.com/show_bug.cgi?id=2530542issue-tracking, x-refsource-redhat
https://github.com/containers/bubblewrap/releases/tag/v0.12.0
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
https://www.openwall.com/lists/oss-security/2026/08/27/7
http://www.openwall.com/lists/oss-security/2026/09/09/3
http://www.openwall.com/lists/oss-security/2026/09/22/23

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.