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Vulnerability record · CVE-2026-87766 · published 9 September 2026

CVE-2026-87766: Link following vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.15% · top 96.4% CWE-59 · Link following Awaiting Analysis
8.8CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
22 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-87766
https://bugs.debian.org/1145655
https://bugzilla.redhat.com/show_bug.cgi?id=2530542
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

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Source: NIST National Vulnerability Database (record CVE-2026-87766), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.