Vulnerability in Red Hat Enterprise Linux 10
CVE-2026-87766
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 · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (5.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-87766 (vdb-entry)
- bugs.debian.org/1145655
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/containers/bubblewrap/releases/tag/v0.12.0
- github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
- www.openwall.com/lists/oss-security/2026/08/27/7
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- access.redhat.com/errata/RHSA-2026:85308 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:85313 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-87766?
- CVE-2026-87766 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2026-09-09.
- How severe is CVE-2026-87766?
- High severity. CVSS v3 base score is 8.8 out of 10.