Vulnerability details
CVE-2026-87766
Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
CVSS 3.1
8.8High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| No product information recorded. | |||
References and advisories
18- https://access.redhat.com/errata/RHSA-2026:85306 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85308 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85309 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85312 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85313 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85317 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85319 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85322 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85324 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:85325 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-87766 vdb-entryx_refsource_REDHAT
- https://bugs.debian.org/1145655
- https://bugzilla.redhat.com/show_bug.cgi?id=2530542 issue-trackingx_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
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Details
- Published
- 2026-09-09
- Last updated
- 2026-11-02
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
0.21%
Probability of exploitation in 30 days
11.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-59Improper Link Resolution Before File Access